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IMGT reference sequences in FASTA format:

Amino acid 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) 
>AP000348|VPREB3*01|Homo sapiens|F|EX1|
MACRCLSFLLMGTFLS
>AP000348|VPREB3*01|Homo sapiens|F|EX2|
AVSQTVLAQLDALLVFPGQVAQLSCTLSPQHVTIRDYGVSWYQQRAGSAPRYLLYYRSEE
DHHRPADIPDRFSAAKDEAHNACVLTISPVQPEDDADYYCSVGYGFSP
>VPREB3*01|Homo sapiens|F|EX1-2|Complete|Splicing V|
MACRCLSFLLMGTFLSVAVSQTVLAQLDALLVFPGQVAQLSCTLSPQHVTIRDYGVSWYQ
QRAGSAPRYLLYYRSEEDHHRPADIPDRFSAAKDEAHNACVLTISPVQPEDDADYYCSVG
YGFSP