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IMGT reference sequences in FASTA format:

Nucleotide sequences with gaps

The FASTA header contains:
IMGT accession number | gene and allele name | species | functionality | exon name | domain name | domain type | alternative splicing (if it is) | partial (if it is) 
>AF142145|CTLA4*01|Mus musculus|F|EX1|
atggcttgtcttggactccggaggtacaaagctcaactgcagctgccttctaggacttgg
ccttttgtagccctgctcactcttcttttcatcccagtcttctctgaag
>AF142145|CTLA4*01|Mus musculus|F|EX2|[D]|V-LIKE|
ccatacaggtgacccaaccttcagtg...gtgttggctagcagccatggtgtcgccagct
ttccatgtgaatattcaccatcacacaacact.........gatgaggtccgggtgactg
tgctgcggcagacaaatgaccaaatgactgaggtctgtgccacgacattcacagag....
..aagaatacagtgggcttcctagattacccc...............ttctgcagtggta
cctttaatgaaagcagagtgaacctcaccatccaaggactgagagctgttgacacgggac
tgtacctctgcaaggtggaactcatgtacccaccgccatactttgtgggcatgggcaacg
ggacgcagatttatgtcattg
>AF142145|CTLA4*01|Mus musculus|F|EX3|
atccagaaccatgcccggattctgacttcctcctttggatccttgtcgcagttagcttgg
ggttgtttttttacagtttcctggtcactgctgtttctttgagcaagatg
>AF142145|CTLA4*01|Mus musculus|F|EX4|
ctaaagaaaagaagtcctcttacaacaggggtctatgtgaaaatgcccccaacagagcca
gaatgtgaaaagcaatttcagccttattttattcccatcaac
>X05719|CTLA4*02|Mus musculus|F|EX1|
atggcttgtcttggactccggaggtacaaagctcaactgcagctgccttctaggacttgg
ccttttgtagccctgctcactcttcttttcatcccagtcttctctgaag
>X05719|CTLA4*02|Mus musculus|F|EX2|[D]|V-LIKE|
ccatacaggtgacccaaccttcagtg...gtgttggctagcagccatggtgtcgccagct
ttccatgtgaatattcaccatcacacaacact.........gatgaggtccgggtgactg
tgctgcggcagacaaatgaccaaatgactgaggtctgtgccacgacattcacagag....
..aagaatacagtgggcttcctagattacccc...............ttctgcagtggta
cctttaatgaaagcagagtgaacctcaccatccaaggactgagagctgttgacacgggac
tgtacctctgcaaggtggaactcatgtacccaccgccatactttgtgggcatgggcaacg
ggacgcagatttatgtcattg
>X05719|CTLA4*02|Mus musculus|F|EX3|
atccagaaccatgcccggattctgacttcctcctttggatccttgtcgcagttagcttgg
ggttgtttttttacagtttcctggtctctgctgtttctttgagcaagatg
>X05719|CTLA4*02|Mus musculus|F|EX4|
ctaaagaaaagaagtcctcttacaacaggggtctatgtgaaaatgcccccaacagagcca
gaatgtgaaaagcaatttcagccttattttattcccatcaac
>BC052683|CTLA4*03|Mus musculus|F|EX1|
atggcttgtcttggactccggaggtacaaagctcaactgcagctgccttctaggacttgg
ccttttgtagccctgctcactcttcttttcatcccagtcttctctgaag
>BC052683|CTLA4*03|Mus musculus|F|EX2|[D]|V-LIKE|
ccatacaggtgacccaaccttcagtg...gtgttggctagcagccatggtgtcgccagct
ttccatgtgaatattcaccatcacacaacact.........gatgaggtccgggtgactg
tgctgcggcagacaaatgaccaaatgactgaggtctgtgccacgacattcacagag....
..aagaatacagtgggcttcctagattacccc...............ttctgcagtggta
cctttaatgaaagcagagtgaacctcaccatccaaggactgagagctgttgacacgggac
tgtacctctgcaaggtggaactcatgtacccaccgccatactttgtgggcatgggcaacg
ggacgcggatttatgtcattg
>BC052683|CTLA4*03|Mus musculus|F|EX3|
atccagaaccatgcccggattctgacttcctcctttggatccttgtcgcagttagcttgg
ggttgtttttttacagtttcctggtcactgctgtttctttgagcaagatg
>BC052683|CTLA4*03|Mus musculus|F|EX4|
ctaaagaaaagaagtcctcttacaacaggggtctatgtgaaaatgcccccaacagagcca
gaatgtgaaaagcaatttcagccttattttattcccatcaac