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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) 
>X03934|CD3D*01|Homo sapiens|F|EX1|
MEHSTFLSGLVLATLLSQ
>X03934|CD3D*01|Homo sapiens|F|EX2|C-LIKE|
..........VSPFKIPIEELE.....DRVFVNCNT.............SITWVE.....
..GTVGTLLS..............DITRLDLGKRIL..DPRGIYRCNGTDI....YKDKE
STVQVHYR
>X03934|CD3D*01|Homo sapiens|F|EX3|
MCQSCVELDPATVAGIIVTDVIATLLLALGVFCFAGHETGRLSG
>X03934|CD3D*01|Homo sapiens|F|EX4|
AADTQALLRNDQVYQ
>X03934|CD3D*01|Homo sapiens|F|EX5|
PLRDRDDAQYSHLGGNWARNK*