diff --git a/src/DAJIN2/core/preprocess/__init__.py b/src/DAJIN2/core/preprocess/__init__.py
index b0d9331..97e03d7 100644
--- a/src/DAJIN2/core/preprocess/__init__.py
+++ b/src/DAJIN2/core/preprocess/__init__.py
@@ -2,8 +2,8 @@
 from DAJIN2.core.preprocess.directory_manager import create_report_directories, create_temporal_directories
 from DAJIN2.core.preprocess.genome_fetcher import fetch_chromosome_size, fetch_coordinates
 from DAJIN2.core.preprocess.input_formatter import format_inputs
-from DAJIN2.core.preprocess.insertions_to_fasta import generate_insertion_fasta
-from DAJIN2.core.preprocess.inversions_to_fasta import generate_inversion_fasta
+from DAJIN2.core.preprocess.insertion_detector import detect_insertions
+from DAJIN2.core.preprocess.inversion_detector import detect_inversions
 from DAJIN2.core.preprocess.knockin_handler import extract_knockin_loci
 from DAJIN2.core.preprocess.mapping import generate_sam
 from DAJIN2.core.preprocess.midsv_caller import generate_midsv
diff --git a/src/DAJIN2/core/preprocess/insertions_to_fasta.py b/src/DAJIN2/core/preprocess/insertion_detector.py
similarity index 86%
rename from src/DAJIN2/core/preprocess/insertions_to_fasta.py
rename to src/DAJIN2/core/preprocess/insertion_detector.py
index 38f572a..4d1ac45 100644
--- a/src/DAJIN2/core/preprocess/insertions_to_fasta.py
+++ b/src/DAJIN2/core/preprocess/insertion_detector.py
@@ -13,26 +13,21 @@
 from sklearn.cluster import MeanShift
 
 from DAJIN2.core.preprocess.mapping import to_sam
+from DAJIN2.core.preprocess.sv_handler import add_unique_allele_keys, extract_unique_sv, save_cstag, save_fasta
 from DAJIN2.utils import config, io
-from DAJIN2.utils.cssplits_handler import convert_cssplits_to_cstag
+from DAJIN2.utils.cssplits_handler import convert_cssplit_to_dna, convert_cssplits_to_cstag
 
 config.set_warnings_ignore()
 
 import cstag
 
-
-def remove_non_alphabets(cssplits: str) -> str:
-    """Convert a cssplits to a plain DNA sequence."""
-    return "".join([char for char in cssplits if char.isalpha()])
-
-
 ###########################################################
 # Cluster insertion alleles
 ###########################################################
 
 
 def clustering_insertions(cssplits_insertion: list[str]) -> list[int]:
-    seq_all = [remove_non_alphabets(seq) for seq in cssplits_insertion]
+    seq_all = [convert_cssplit_to_dna(seq) for seq in cssplits_insertion]
     query = seq_all[0]
     _, distances, _ = zip(*process.extract_iter(query, seq_all, scorer=DamerauLevenshtein.normalized_distance))
 
@@ -225,7 +220,7 @@ def subset_insertions(
                 sequences = random.sample(cs_insertion, num_subset)
             else:
                 sequences = cs_insertion
-            sequences = tuple(remove_non_alphabets(seq) for seq in sequences)
+            sequences = tuple(convert_cssplit_to_dna(seq) for seq in sequences)
             insertions_merged_subset[idx_grouped][sequences] = counts
 
     return dict(insertions_merged_subset)
@@ -272,7 +267,7 @@ def extract_score_and_sequence(
                 flag_break = False
                 for seqs, count in insertions_merged_subset[idx_grouped].items():
                     for _, distance, _ in process.extract_iter(
-                        remove_non_alphabets(cssplits[idx]), seqs, scorer=DamerauLevenshtein.normalized_distance
+                        convert_cssplit_to_dna(cssplits[idx]), seqs, scorer=DamerauLevenshtein.normalized_distance
                     ):
                         # Record the insertion sequence and count if the sample and insertion sequences are similar
                         if distance < 0.1:
@@ -482,68 +477,6 @@ def generate_fasta(cstag_insertions: dict[str, str]) -> dict[str, str]:
     return fasta_insertions
 
 
-def extract_unique_insertions(fasta_insertions: dict[str, str], FASTA_ALLELES: dict[str, str]) -> dict[str, str]:
-    """
-    Extract unique insertion alleles if they are dissimilar to the FASTA_ALLELES input by the user.
-    "Unique insertion alleles" are defined as sequences that have a difference of more than 10 bases compared to the sequences in FASTA_ALLELES
-    """
-    fasta_insertions_unique = fasta_insertions.copy()
-
-    # Remove insertion alleles that are similar to the FASTA_ALLELES input by the user
-    to_delete = set()
-    for key, seq in fasta_insertions_unique.items():
-        _, distances, _ = zip(*process.extract_iter(seq, FASTA_ALLELES.values(), scorer=DamerauLevenshtein.distance))
-        if any(d < 10 for d in distances):
-            to_delete |= {key}
-
-    # Remove insertion alleles that are similar to each other
-    for key, seq in fasta_insertions_unique.items():
-        if key in to_delete:
-            continue
-        _, distances, _ = zip(
-            *process.extract_iter(seq, fasta_insertions_unique.values(), scorer=DamerauLevenshtein.distance)
-        )
-        similar_index = {i if d < 10 else None for i, d in enumerate(distances) if i != key}
-        to_delete |= similar_index
-
-    return {k: v for k, v in fasta_insertions_unique.items() if k not in to_delete}
-
-
-def update_labels(d: dict, FASTA_ALLELES: dict) -> dict:
-    """
-    Update labels to avoid duplicating user-specified alleles.
-    If the allele 'insertion1' exists in FASTA_ALLELES, increment the digits.
-    (insertion1 -> insertion01 -> insertion001...)
-    """
-    user_defined_alleles = set(FASTA_ALLELES)
-    d_values = list(d.values())
-    len_d = len(d_values)
-    digits_up = 0
-    while True:
-        digits = len(str(len_d)) + digits_up
-        d_updated = {f"insertion{i+1:0{digits}}": seq for i, seq in enumerate(d_values)}
-        if user_defined_alleles.isdisjoint(set(d_updated)):
-            break
-        digits_up += 1
-
-    return d_updated
-
-
-###########################################################
-# Save cstag and fasta
-###########################################################
-
-
-def save_fasta(TEMPDIR: Path | str, SAMPLE_NAME: str, fasta_insertions: dict[str, str]) -> None:
-    for header, seq in fasta_insertions.items():
-        Path(TEMPDIR, SAMPLE_NAME, "fasta", f"{header}.fasta").write_text(f">{header}\n{seq}\n")
-
-
-def save_cstag(TEMPDIR: Path | str, SAMPLE_NAME: str, cstag_insertions: dict[str, str]) -> None:
-    for header, cs_tag in cstag_insertions.items():
-        Path(TEMPDIR, SAMPLE_NAME, "cstag", f"{header}.txt").write_text(cs_tag + "\n")
-
-
 ###########################################################
 # main
 ###########################################################
@@ -554,7 +487,7 @@ def remove_temporal_files(TEMPDIR: Path, SAMPLE_NAME: str) -> None:
     _ = [path.unlink() for path in Path(TEMPDIR, SAMPLE_NAME, "fasta").glob("query-*.fasta")]
 
 
-def generate_insertion_fasta(TEMPDIR, SAMPLE_NAME, CONTROL_NAME, FASTA_ALLELES) -> None:
+def detect_insertions(TEMPDIR, SAMPLE_NAME, CONTROL_NAME, FASTA_ALLELES) -> None:
     PATH_SAMPLE = Path(TEMPDIR, SAMPLE_NAME, "midsv", "control", f"{SAMPLE_NAME}.jsonl")
     PATH_CONTROL = Path(TEMPDIR, CONTROL_NAME, "midsv", "control", f"{CONTROL_NAME}.jsonl")
     MUTATION_LOCI = io.load_pickle(Path(TEMPDIR, SAMPLE_NAME, "mutation_loci", "control", "mutation_loci.pickle"))
@@ -596,7 +529,7 @@ def generate_insertion_fasta(TEMPDIR, SAMPLE_NAME, CONTROL_NAME, FASTA_ALLELES)
     index_of_insertions = extract_index_of_insertions(insertions, insertions_merged)
     cstag_insertions = generate_cstag(consensus_of_insertions, index_of_insertions, FASTA_ALLELES["control"])
     fasta_insertions = generate_fasta(cstag_insertions)
-    fasta_insertions_unique = extract_unique_insertions(fasta_insertions, FASTA_ALLELES)
+    fasta_insertions_unique = extract_unique_sv(fasta_insertions, FASTA_ALLELES)
 
     if fasta_insertions_unique == {}:
         remove_temporal_files(TEMPDIR, SAMPLE_NAME)
@@ -604,8 +537,8 @@ def generate_insertion_fasta(TEMPDIR, SAMPLE_NAME, CONTROL_NAME, FASTA_ALLELES)
 
     # Update labels
     cstag_insertions_update = {key: cstag_insertions[key] for key in fasta_insertions_unique.keys()}
-    cstag_insertions_update = update_labels(cstag_insertions_update, FASTA_ALLELES)
-    fasta_insertions_update = update_labels(fasta_insertions_unique, FASTA_ALLELES)
+    cstag_insertions_update = add_unique_allele_keys(cstag_insertions_update, FASTA_ALLELES, "insertion")
+    fasta_insertions_update = add_unique_allele_keys(fasta_insertions_unique, FASTA_ALLELES, "insertion")
 
     save_cstag(TEMPDIR, SAMPLE_NAME, cstag_insertions_update)
     save_fasta(TEMPDIR, SAMPLE_NAME, fasta_insertions_update)
diff --git a/src/DAJIN2/core/preprocess/inversions_to_fasta.py b/src/DAJIN2/core/preprocess/inversion_detector.py
similarity index 69%
rename from src/DAJIN2/core/preprocess/inversions_to_fasta.py
rename to src/DAJIN2/core/preprocess/inversion_detector.py
index d1b73be..b99039d 100644
--- a/src/DAJIN2/core/preprocess/inversions_to_fasta.py
+++ b/src/DAJIN2/core/preprocess/inversion_detector.py
@@ -10,20 +10,14 @@
 from sklearn.cluster import MeanShift
 
 from DAJIN2.core.consensus.consensus import call_percentage
-from DAJIN2.core.preprocess.insertions_to_fasta import extract_unique_insertions
+from DAJIN2.core.preprocess.sv_handler import add_unique_allele_keys, extract_unique_sv, save_cstag, save_fasta
 from DAJIN2.utils import config, io
-from DAJIN2.utils.cssplits_handler import convert_cssplits_to_cstag, revcomp_cssplits
+from DAJIN2.utils.cssplits_handler import convert_cssplit_to_dna, convert_cssplits_to_cstag, revcomp_cssplits
 
 config.set_warnings_ignore()
 
 import cstag
 
-
-def remove_non_alphabets(cssplit: str) -> str:
-    """Convert a cssplit to a plain DNA sequence."""
-    return "".join([char for char in cssplit if char.isalpha()])
-
-
 ###########################################################
 # Detect insertion sequences
 ###########################################################
@@ -47,7 +41,7 @@ def extract_inversions(midsv_sample: Generator[list[str]]) -> list[dict[int, int
                 {
                     "start": min_idx,
                     "end": max_idx,
-                    "seq": remove_non_alphabets(",".join(cs_inversion)),
+                    "seq": convert_cssplit_to_dna(",".join(cs_inversion)),
                     "CSSPLIT": m_sample["CSSPLIT"],
                 }
             )
@@ -127,59 +121,12 @@ def call_consensus_of_inversion(
     return consensus_of_inversions
 
 
-###########################################################
-# Update keys
-###########################################################
-
-
-def _check_duplicates_of_sets(set1: set[str], set2: set[str]) -> bool:
-    """if True, there are duplicates."""
-    union_set = set1.union(set2)
-    total_elements = len(set1) + len(set2)
-    return len(union_set) != total_elements
-
-
-def update_labels(ALLELES: dict[str, str], FASTA_ALLELES: dict[str, set], key: str) -> dict:
-    """
-    Update labels to avoid duplicating user-specified alleles.
-    If the allele 'insertion1' exists in FASTA_ALLELES, increment the digits.
-    (insertion1 -> insertion01 -> insertion001...)
-    """
-    user_defined_alleles = set(FASTA_ALLELES)
-    key_alleles = {allele for allele in user_defined_alleles if key in allele}
-    if key_alleles == set():
-        return {f"inversion{i+1}": value for i, value in enumerate(ALLELES.values())}
-
-    key_candidates = set()
-    digits = 2
-    while _check_duplicates_of_sets(key_candidates, key_alleles):
-        key_candidates = {f"{key}{i+1:0{digits}}" for i, _ in enumerate(ALLELES)}
-        digits += 1
-
-    return dict(zip(key_candidates, ALLELES.values()))
-
-
-###########################################################
-# Save cstag and fasta
-###########################################################
-
-
-def save_fasta(TEMPDIR: Path | str, SAMPLE_NAME: str, fasta_insertions: dict[str, str]) -> None:
-    for header, seq in fasta_insertions.items():
-        Path(TEMPDIR, SAMPLE_NAME, "fasta", f"{header}.fasta").write_text(f">{header}\n{seq}\n")
-
-
-def save_cstag(TEMPDIR: Path | str, SAMPLE_NAME: str, cstag_insertions: dict[str, str]) -> None:
-    for header, cs_tag in cstag_insertions.items():
-        Path(TEMPDIR, SAMPLE_NAME, "cstag", f"{header}.txt").write_text(cs_tag + "\n")
-
-
 ###########################################################
 # main
 ###########################################################
 
 
-def generate_inversion_fasta(TEMPDIR, SAMPLE_NAME, CONTROL_NAME, FASTA_ALLELES) -> None:
+def detect_inversions(TEMPDIR, SAMPLE_NAME, CONTROL_NAME, FASTA_ALLELES) -> None:
     path_sample = Path(TEMPDIR, SAMPLE_NAME, "midsv", "control", f"{SAMPLE_NAME}.jsonl")
     # path_control = Path(TEMPDIR, CONTROL_NAME, "midsv", "control", f"{CONTROL_NAME}.jsonl")
     mutation_loci = io.load_pickle(Path(TEMPDIR, SAMPLE_NAME, "mutation_loci", "control", "mutation_loci.pickle"))
@@ -197,12 +144,12 @@ def generate_inversion_fasta(TEMPDIR, SAMPLE_NAME, CONTROL_NAME, FASTA_ALLELES)
 
     seq_inversions = {key: d["SEQ"] for key, d in consensus_of_inversions.items()}
     consensus_of_unique_inversions = {
-        key: consensus_of_inversions[key] for key in extract_unique_insertions(seq_inversions, FASTA_ALLELES)
+        key: consensus_of_inversions[key] for key in extract_unique_sv(seq_inversions, FASTA_ALLELES)
     }
     if consensus_of_unique_inversions == {}:
         return None
 
-    consensus_of_unique_inversions = update_labels(consensus_of_unique_inversions, FASTA_ALLELES, "inversion")
+    consensus_of_unique_inversions = add_unique_allele_keys(consensus_of_unique_inversions, FASTA_ALLELES, "inversion")
 
     save_fasta(TEMPDIR, SAMPLE_NAME, {key: d["SEQ"] for key, d in consensus_of_unique_inversions.items()})
     save_cstag(TEMPDIR, SAMPLE_NAME, {key: d["CSTAG"] for key, d in consensus_of_unique_inversions.items()})
diff --git a/src/DAJIN2/utils/cssplits_handler.py b/src/DAJIN2/utils/cssplits_handler.py
index 46959b7..f884432 100644
--- a/src/DAJIN2/utils/cssplits_handler.py
+++ b/src/DAJIN2/utils/cssplits_handler.py
@@ -26,6 +26,11 @@ def find_n_boundaries(cssplits: list[str]) -> tuple[int, int]:
 
     return left_idx_n - 1, right_idx_n + 1
 
+# ToDo: 点変異が扱えていない。convert_cssplits_to_cstagをinversion検出用に改変すれば、必要なくなる。
+def convert_cssplit_to_dna(cssplit: str) -> str:
+    """Convert a cssplit to a plain DNA sequence."""
+    return "".join([char for char in cssplit if char.isalpha()])
+
 
 ###########################################################
 # reverse complement to cssplits