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) 
>AF115529|MH2-DB2*01|Oncorhynchus mykiss|F|EX1|splicing a|complete|
MSKSIRFYICLAVALSTLYET
>AF115529|MH2-DB2*01|Oncorhynchus mykiss|F|EX2|[D1]|G-BETA-DOMAIN|splicing a|complete|
GYASDVVTRCLYSSIDMHGAEFIQSYTFNKVEHLRFNSTVGEFVGYTELGLKNAKRLNRG
QEVVQMRGELERLCKPNADIHYRAILDKT
>AF115529|MH2-DB2*01|Oncorhynchus mykiss|F|EX3|[D2]|C-LIKE-DOMAIN|splicing a|complete|
EPHVRLSSVTPPSGRHPAMLMCSAYDFYPKPIRVTWLRDGREVKSDVTSTEELANGDWYY
QIHSHLEYTPKSGEKISCMVEHISLTEPMMYHW
>AF115529|MH2-DB2*01|Oncorhynchus mykiss|F|EX4|splicing a|complete|
PSLPEAERNKIAIGASGLVLGTILALAGLIYYKKKSS
>AF115529|MH2-DB2*01|Oncorhynchus mykiss|F|EX5|complete|
VL
>AF115529|MH2-DB2*01|Oncorhynchus mykiss|F|EX1-5|splicing A|protein isoform A|complete|
MSKSIRFYICLAVALSTLYETDGYASDVVTRCLYSSIDMHGAEFIQSYTFNKVEHLRFNS
TVGEFVGYTELGLKNAKRLNRGQEVVQMRGELERLCKPNADIHYRAILDKTVEPHVRLSS
VTPPSGRHPAMLMCSAYDFYPKPIRVTWLRDGREVKSDVTSTEELANGDWYYQIHSHLEY
TPKSGEKISCMVEHISLTEPMMYHWDPSLPEAERNKIAIGASGLVLGTILALAGLIYYKK
KSSGVL