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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) 
>M74363|CTLA4*01|Homo sapiens|F|EX1|
atggcttgccttggatttcagcggcacaaggctcagctgaacctggctaccaggacctgg
ccctgcactctcctgttttttcttctcttcatccctgtcttctgcaaag
>M37243|CTLA4*01|Homo sapiens|F|EX2|[D]|V-LIKE|
caatgcacgtggcccagcctgctgtg...gtactggccagcagccgaggcatcgccagct
ttgtgtgtgagtatgcatctccaggcaaagcc.........actgaggtccgggtgacag
tgcttcggcaggctgacagccaggtgactgaagtctgtgcggcaacctacatgatg....
..gggaatgagttgaccttcctagatgattcc...............atctgcacgggca
cctccagtggaaatcaagtgaacctcactatccaaggactgagggccatggacacgggac
tctacatctgcaaggtggagctcatgtacccaccgccatactacctgggcataggcaacg
gagcccagatttatgtaattg
>M37244|CTLA4*01|Homo sapiens|F|EX3|
atccagaaccgtgcccagattctgacttcctcctctggatccttgcagcagttagttcgg
ggttgtttttttatagctttctcctcacagctgtttctttgagcaaaatg
>M37245|CTLA4*01|Homo sapiens|F|EX4|
ctaaagaaaagaagccctcttacaacaggggtctatgtgaaaatgcccccaacagagcca
gaatgtgaaaagcaatttcagccttattttattcccatcaat
>AC010138|CTLA4*02|Homo sapiens|F|EX1|
atggcttgccttggatttcagcggcacaaggctcagctgaacctggctaccaggacctgg
ccctgcactctcctgttttttcttctcttcatccctgtcttctgcaaag
>AC010138|CTLA4*02|Homo sapiens|F|EX2|[D]|V-LIKE|
caatgcacgtggcccagcctgctgtg...gtactggccagcagccgaggcatcgccagct
ttgtgtgtgagtatgcatctccaggcaaagcc.........actgaggtccgggtgacag
tgcttcggcaggctgacagccaggtgactgaagtctgtgcggcaacctacatgatg....
..gggaatgagttgaccttcctagatgattcc...............atctgcacgggca
cctccagtggaaatcaagtgaacctcactatccaaggactgagggccatggacacgggac
tctacatctgcaaggtggagctcatgtacccaccgccatactacctgggcataggcaacg
gaacccagatttatgtaattg
>AC010138|CTLA4*02|Homo sapiens|F|EX3|
atccagaaccgtgcccagattctgacttcctcctctggatccttgcagcagttagttcgg
ggttgtttttttatagctttctcctcacagctgtttctttgagcaaaatg
>AC010138|CTLA4*02|Homo sapiens|F|EX4|
ctaaagaaaagaagccctcttacaacaggggtctatgtgaaaatgcccccaacagagcca
gaatgtgaaaagcaatttcagccttattttattcccatcaat
>AF411058|CTLA4*03|Homo sapiens|F|EX1|
atggcttgccttggatttcagcggcacaaggctgagctgaacctggctaccaggacctgg
ccctgcactctcctgttttttcttctcttcatccctgtcttctgcaaag
>AF411058|CTLA4*03|Homo sapiens|F|EX2|[D]|V-LIKE|
caatgcacgtggcccagcctgctgtg...gtactggccagcagccgaggcatcgccagct
ttgtgtgtgagtatgcatctccaggcaaagcc.........actgaggtccgggtgacag
tgcttcggcaggctgacagccaggtgactgaagtctgtgcggcaacctacatgatg....
..gggaatgagttgaccttcctagatgattcc...............atctgcacgggca
cctccagtggaaatcaagtgaacctcactatccaaggactgagggccatggacacgggac
tctacatctgcaaggtggagctcatgtacccaccgccatactacctgggcataggcaacg
gaacccagatttatgtaattg
>AF411058|CTLA4*03|Homo sapiens|F|EX3|
atccagaaccgtgcccagattctgacttcctcctctggatccttgcagcagttagttcgg
ggttgtttttttatagctttctcctcacagctgtttctttgagcaaaatg
>AF411058|CTLA4*03|Homo sapiens|F|EX4|
ctaaagaaaagaagccctcttacaacaggggtctatgtgaaaatgcccccaacagagcca
gaatgtgaaaagcaatttcagccttattttattcccatcaat