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IMGT reference sequences in FASTA format:

Amino acid 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) 
>AY346100|B7H4*01|Homo sapiens|F|EX1|
MASLGQILFWS
>AY346100|B7H4*01|Homo sapiens|F|EX2|
IISIIIILAGAIALIIGFGIS
>AY346100|B7H4*01|Homo sapiens|F|EX3|[D1]|V-LIKE|
GRHSITVTTVASAGNIGEDGIQSCTFEPDIKL...SDIVIQWLKEGVLGLVHEFKEGKD.
...ELSEQDEMFRGRTAVFADQVIVGNASLRLKNVQLTDAGTYKCYIITS....KGKGNA
NLEYKTG
>AY346100|B7H4*01|Homo sapiens|F|EX4|[D2]|C-LIKE|
AFSMPEVNVDYNAS......SETLRCEAPRWFP...QPTVVWASQVDQGANFSEVSNTSF
ELNS.........ENVTMKVVSVLYNV..TINNTYSCMIENDIAKATGDIKVT
>AY346100|B7H4*01|Homo sapiens|F|EX5|
ESEIKRRSHLQLLNSKASLCVSSFFAISWALLPLSPYLMLK
>DQ103757|B7H4*01|Homo sapiens|F|EX1|
MASLGQILFWS
>DQ103757|B7H4*01|Homo sapiens|F|EX2|
IISIIIILAGAIALIIGFGIS
>DQ103757|B7H4*01|Homo sapiens|F|EX4|
AFSMPEVNVDYNAS......SETLRCEAPRWFP...QPTVVWASQVDQGANFSEVSNTSF
ELNS.........ENVTMKVVSVLYNV..TINNTYSCMIENDIAKATGDIKVT
>DQ103757|B7H4*01|Homo sapiens|F|EX5|
ESEIKRRSHLQLLNSKASLCVSSFFAISWALLPLSPYLMLK
>AY442303|B7H4*01|Homo sapiens|F|EX1|
MASLGQILFWS
>AY442303|B7H4*01|Homo sapiens|F|EX2|
IISIIIILAGAIALIIGFGIS
>AY442303|B7H4*01|Homo sapiens|F|EX3|
EVSVWLSAMKGWCRSSKASLSIDLCFLNFRETLHHSHYCRLSWEHWGGWNPELHF
>AL391476|B7H4*02|Homo sapiens|F|EX1|
MVLLTSRMKPLTSR
>AL391476|B7H4*02|Homo sapiens|F|EX2|
IISIIIILAGAIALIIGFGIS
>AL391476|B7H4*02|Homo sapiens|F|EX3|[D1]|V-LIKE|
GRHSITVTTVASAGNIGEDGILSCTFEPDIKL...SDIVIQWLKEGVLGLVHEFKEGKD.
...ELSEQDEMFRGRTAVFADQVIVGNASLRLKNVQLTDAGTYKCYIITS....KGKGNA
NLEYKTG
>AL391476|B7H4*02|Homo sapiens|F|EX4|[D2]|C-LIKE|
AFSMPEVNVDYNAS......SETLRCEAPRWFP...QPTVVWASQVDQGANFSEVSNTSF
ELNS.........ENVTMKVVSVLYNV..TINNTYSCMIENDIAKATGDIKVT
>AL391476|B7H4*02|Homo sapiens|F|EX5|
ESEIKRRSHLQLLNSKASLCVSSFFAISWALLPLSPYLMLK