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) 
>U20943|MH2-DB1*01|Oncorhynchus mykiss|F|EX1|splicing A|complete|
ATGTCGATGCCAATTGCCTTCTACATTTGCCTGACCCTGTTATGGTCCATATTCTCTGGA
ACAG
>U20943|MH2-DB1*01|Oncorhynchus mykiss|F|EX2|splicing A|complete|
ATGGATATTTTGAACAGGTTGTGAGACAGTGTCGATACTCCTCAAAGGACCTGCATGGTA
TAGAGTTTATAGACTCTTATGTTTTCAATAAGGCTGAACATGTCAGATTCAACAGCACTG
TGGGGAGGTATGTTGGATACACTGAACATGGTCTGAAGAATGCAGAAGCATGGAACAGTG
ATGCTGGGATCCTGGGTCAAGAGCAGGCGGAGCTGGAGCGTTACTGTAAGCCTAGCGCTG
CTATCGACTACAGCGCCATACTGGACAAGACAG
>U20943|MH2-DB1*01|Oncorhynchus mykiss|F|EX3|splicing A|complete|
TTGAGCCCCATGTCAGACTGAGCTCAGTGACTCCCCCCAGTGGCAGACACCCTGCCATGC
TGATGTGCAGCGCCTATGACTTCTACCCCAAACAAATCAGAGTGACCTGGCTGAGGGACG
GACGTGAGGTGAAATCTGATGTGACCTCCACTGAGGAGCTGGCTAACGGGGACTGGTACT
ACCAGATCCACTCCCACCTGGAGTACACACCCAAGTCTGGAGAGAAGATCTCCTGTATGG
TGGAGCACATCAGCCTCACTGAGCCCATGATGTATCACTGGG
>U20943|MH2-DB1*01|Oncorhynchus mykiss|F|EX4|splicing A|complete|
ACCCGTCCCTGCCTGAGGCTGAGAGGAATAAGATAGCGATCGGTGCATCTGGTCTGGTGC
TGGGAACCATCTTAGCATTAGCAGGACTGATCTACTACAAGAAGAAGTCTTCTG
>U20943|MH2-DB1*01|Oncorhynchus mykiss|F|EX5|splicing A|complete|
GGGTGCTC
>U20943|MH2-DB1*01|Oncorhynchus mykiss|F|EX1-5|splicing A|complete|
ATGTCGATGCCAATTGCCTTCTACATTTGCCTGACCCTGTTATGGTCCATATTCTCTGGA
ACAGATGGATATTTTGAACAGGTTGTGAGACAGTGTCGATACTCCTCAAAGGACCTGCAT
GGTATAGAGTTTATAGACTCTTATGTTTTCAATAAGGCTGAACATGTCAGATTCAACAGC
ACTGTGGGGAGGTATGTTGGATACACTGAACATGGTCTGAAGAATGCAGAAGCATGGAAC
AGTGATGCTGGGATCCTGGGTCAAGAGCAGGCGGAGCTGGAGCGTTACTGTAAGCCTAGC
GCTGCTATCGACTACAGCGCCATACTGGACAAGACAGTTGAGCCCCATGTCAGACTGAGC
TCAGTGACTCCCCCCAGTGGCAGACACCCTGCCATGCTGATGTGCAGCGCCTATGACTTC
TACCCCAAACAAATCAGAGTGACCTGGCTGAGGGACGGACGTGAGGTGAAATCTGATGTG
ACCTCCACTGAGGAGCTGGCTAACGGGGACTGGTACTACCAGATCCACTCCCACCTGGAG
TACACACCCAAGTCTGGAGAGAAGATCTCCTGTATGGTGGAGCACATCAGCCTCACTGAG
CCCATGATGTATCACTGGGACCCGTCCCTGCCTGAGGCTGAGAGGAATAAGATAGCGATC
GGTGCATCTGGTCTGGTGCTGGGAACCATCTTAGCATTAGCAGGACTGATCTACTACAAG
AAGAAGTCTTCTGGGGTGCTC