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IMGT reference sequences in FASTA format:

Nucleotide sequences without 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|
caatgcacgtggcccagcctgctgtggtactggccagcagccgaggcatcgccagctttg
tgtgtgagtatgcatctccaggcaaagccactgaggtccgggtgacagtgcttcggcagg
ctgacagccaggtgactgaagtctgtgcggcaacctacatgatggggaatgagttgacct
tcctagatgattccatctgcacgggcacctccagtggaaatcaagtgaacctcactatcc
aaggactgagggccatggacacgggactctacatctgcaaggtggagctcatgtacccac
cgccatactacctgggcataggcaacggagcccagatttatgtaattg
>M37244|CTLA4*01|Homo sapiens|F|EX3|
atccagaaccgtgcccagattctgacttcctcctctggatccttgcagcagttagttcgg
ggttgtttttttatagctttctcctcacagctgtttctttgagcaaaatg
>M37245|CTLA4*01|Homo sapiens|F|EX4|
ctaaagaaaagaagccctcttacaacaggggtctatgtgaaaatgcccccaacagagcca
gaatgtgaaaagcaatttcagccttattttattcccatcaat
>CTLA4*01|Homo sapiens|F|EX1-EX4|Splicing A|complete|
atggcttgccttggatttcagcggcacaaggctcagctgaacctggctaccaggacctgg
ccctgcactctcctgttttttcttctcttcatccctgtcttctgcaaagcaatgcacgtg
gcccagcctgctgtggtactggccagcagccgaggcatcgccagctttgtgtgtgagtat
gcatctccaggcaaagccactgaggtccgggtgacagtgcttcggcaggctgacagccag
gtgactgaagtctgtgcggcaacctacatgatggggaatgagttgaccttcctagatgat
tccatctgcacgggcacctccagtggaaatcaagtgaacctcactatccaaggactgagg
gccatggacacgggactctacatctgcaaggtggagctcatgtacccaccgccatactac
ctgggcataggcaacggagcccagatttatgtaattgatccagaaccgtgcccagattct
gacttcctcctctggatccttgcagcagttagttcggggttgtttttttatagctttctc
ctcacagctgtttctttgagcaaaatgctaaagaaaagaagccctcttacaacaggggtc
tatgtgaaaatgcccccaacagagccagaatgtgaaaagcaatttcagccttattttatt
cccatcaattga
>AC010138|CTLA4*02|Homo sapiens|F|EX1|
atggcttgccttggatttcagcggcacaaggctcagctgaacctggctaccaggacctgg
ccctgcactctcctgttttttcttctcttcatccctgtcttctgcaaag
>AC010138|CTLA4*02|Homo sapiens|F|EX2|[D]|V-LIKE|
caatgcacgtggcccagcctgctgtggtactggccagcagccgaggcatcgccagctttg
tgtgtgagtatgcatctccaggcaaagccactgaggtccgggtgacagtgcttcggcagg
ctgacagccaggtgactgaagtctgtgcggcaacctacatgatggggaatgagttgacct
tcctagatgattccatctgcacgggcacctccagtggaaatcaagtgaacctcactatcc
aaggactgagggccatggacacgggactctacatctgcaaggtggagctcatgtacccac
cgccatactacctgggcataggcaacggaacccagatttatgtaattg
>AC010138|CTLA4*02|Homo sapiens|F|EX3|
atccagaaccgtgcccagattctgacttcctcctctggatccttgcagcagttagttcgg
ggttgtttttttatagctttctcctcacagctgtttctttgagcaaaatg
>AC010138|CTLA4*02|Homo sapiens|F|EX4|
ctaaagaaaagaagccctcttacaacaggggtctatgtgaaaatgcccccaacagagcca
gaatgtgaaaagcaatttcagccttattttattcccatcaat
>CTLA4*02|Homo sapiens|F|EX1-EX4|Splicing A|complete|
atggcttgccttggatttcagcggcacaaggctcagctgaacctggctaccaggacctgg
ccctgcactctcctgttttttcttctcttcatccctgtcttctgcaaagcaatgcacgtg
gcccagcctgctgtggtactggccagcagccgaggcatcgccagctttgtgtgtgagtat
gcatctccaggcaaagccactgaggtccgggtgacagtgcttcggcaggctgacagccag
gtgactgaagtctgtgcggcaacctacatgatggggaatgagttgaccttcctagatgat
tccatctgcacgggcacctccagtggaaatcaagtgaacctcactatccaaggactgagg
gccatggacacgggactctacatctgcaaggtggagctcatgtacccaccgccatactac
ctgggcataggcaacggaacccagatttatgtaattgatccagaaccgtgcccagattct
gacttcctcctctggatccttgcagcagttagttcggggttgtttttttatagctttctc
ctcacagctgtttctttgagcaaaatgctaaagaaaagaagccctcttacaacaggggtc
tatgtgaaaatgcccccaacagagccagaatgtgaaaagcaatttcagccttattttatt
cccatcaattga
>AF411058|CTLA4*03|Homo sapiens|F|EX1|
atggcttgccttggatttcagcggcacaaggctcagctgaacctggctgccaggacctgg
ccctgcactctcctgttttttcttctcttcatccctgtcttctgcaaag
>AF411058|CTLA4*03|Homo sapiens|F|EX2|[D]|V-LIKE|
caatgcacgtggcccagcctgctgtggtactggccagcagccgaggcatcgccagctttg
tgtgtgagtatgcatctccaggcaaagccactgaggtccgggtgacagtgcttcggcagg
ctgacagccaggtgactgaagtctgtgcggcaacctacatgatggggaatgagttgacct
tcctagatgattccatctgcacgggcacctccagtggaaatcaagtgaacctcactatcc
aaggactgagggccatggacacgggactctacatctgcaaggtggagctcatgtacccac
cgccatactacctgggcataggcaacggaacccagatttatgtaattg
>AF411058|CTLA4*03|Homo sapiens|F|EX3|
atccagaaccgtgcccagattctgacttcctcctctggatccttgcagcagttagttcgg
ggttgtttttttatagctttctcctcacagctgtttctttgagcaaaatg
>AF411058|CTLA4*03|Homo sapiens|F|EX4|
ctaaagaaaagaagccctcttacaacaggggtctatgtgaaaatgcccccaacagagcca
gaatgtgaaaagcaatttcagccttattttattcccatcaat
>CTLA4*03|Homo sapiens|F|EX1-EX4|Splicing A|complete|
atggcttgccttggatttcagcggcacaaggctcagctgaacctggctgccaggacctgg
ccctgcactctcctgttttttcttctcttcatccctgtcttctgcaaagcaatgcacgtg
gcccagcctgctgtggtactggccagcagccgaggcatcgccagctttgtgtgtgagtat
gcatctccaggcaaagccactgaggtccgggtgacagtgcttcggcaggctgacagccag
gtgactgaagtctgtgcggcaacctacatgatggggaatgagttgaccttcctagatgat
tccatctgcacgggcacctccagtggaaatcaagtgaacctcactatccaaggactgagg
gccatggacacgggactctacatctgcaaggtggagctcatgtacccaccgccatactac
ctgggcataggcaacggaacccagatttatgtaattgatccagaaccgtgcccagattct
gacttcctcctctggatccttgcagcagttagttcggggttgtttttttatagctttctc
ctcacagctgtttctttgagcaaaatgctaaagaaaagaagccctcttacaacaggggtc
tatgtgaaaatgcccccaacagagccagaatgtgaaaagcaatttcagccttattttatt
cccatcaattga