Here you are: IMGT Web resources > IMGT Repertoire (RPI) > RPI entries from gene to protein

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) 
>AY322147|B7H4*01|Mus musculus|F|EX1|
atggcttccttggggcagatcatcttttggag
>AY322147|B7H4*01|Mus musculus|F|EX2|
tattattaacatcatcatcatcctggctggggccatcgcactcatcattggctttggcat
ttcag
>AY322147|B7H4*01|Mus musculus|F|EX3|[D1]|V-LIKE|
gcaagcacttcatcacggtcacgaccttcacctcagctggaaacattggagaggacggga
ccctgagctgcacttttgaacctgacatcaaactcaacggcatcgtcatccagtggctga
aagaaggcatcaaaggtttggtccacgagttcaaagaaggcaaagacgacctctcacagc
agcatgagatgttcagaggccgcacagcagtgtttgctgatcaggtggtagttggcaatg
cttccctgagactgaaaaacgtgcagctcacggatgctggcacctacacatgttacatcc
gcacctcaaaaggcaaagggaatgcaaaccttgagtataagaccggag
>AY322147|B7H4*01|Mus musculus|F|EX4|[D2]|C-LIKE|
ccttcagtatgccagagataaatgtggactataatgccagttcagagagtttacgctgcg
aggctcctcggtggttcccccagcccacagtggcctgggcatctcaagtcgaccaaggag
ccaatttctcagaagtctccaacaccagctttgagttgaactctgagaatgtgaccatga
aggtcgtatctgtgctctacaatgtcacaatcaacaacacatactcctgtatgattgaaa
acgacattgccaaagccaccggggacatcaaagtgacag
>AY322147|B7H4*01|Mus musculus|F|EX5|
attcagaggtcaaaaggcggagtcagctgcagctgctcaactccgggccttccccgtgtg
ttttttcttctgcctttgcggctggctgggcgctcctatctctctcctgttgcctgatgc
taaga
>B7H4*01|Mus musculus|F|EX1-EX5|Splicing A|complete|
atggcttccttggggcagatcatcttttggagtattattaacatcatcatcatcctggct
ggggccatcgcactcatcattggctttggcatttcaggcaagcacttcatcacggtcacg
accttcacctcagctggaaacattggagaggacgggaccctgagctgcacttttgaacct
gacatcaaactcaacggcatcgtcatccagtggctgaaagaaggcatcaaaggtttggtc
cacgagttcaaagaaggcaaagacgacctctcacagcagcatgagatgttcagaggccgc
acagcagtgtttgctgatcaggtggtagttggcaatgcttccctgagactgaaaaacgtg
cagctcacggatgctggcacctacacatgttacatccgcacctcaaaaggcaaagggaat
gcaaaccttgagtataagaccggagccttcagtatgccagagataaatgtggactataat
gccagttcagagagtttacgctgcgaggctcctcggtggttcccccagcccacagtggcc
tgggcatctcaagtcgaccaaggagccaatttctcagaagtctccaacaccagctttgag
ttgaactctgagaatgtgaccatgaaggtcgtatctgtgctctacaatgtcacaatcaac
aacacatactcctgtatgattgaaaacgacattgccaaagccaccggggacatcaaagtg
acagattcagaggtcaaaaggcggagtcagctgcagctgctcaactccgggccttccccg
tgtgttttttcttctgcctttgcggctggctgggcgctcctatctctctcctgttgcctg
atgctaagatga