>seq1
ASTPGHTIIYEATSVCLHNDRTTIP
>seq2 optional comment
ASQKRPSQRHGSKYLATASTMDHARHGFLPRHRDTGILDSIGRFFGGDRGAPK
NMYKDSHHPARTAHYGSLPQKSHGRTQDENPVVHFFKNIVTPRTPPPSQGKGR
KSAHKGFKGVDAQGTLSKIFKLGGRDSRSGSPMARRELVISLIVES
Please note that empty lines are not accepted, all sequences must have a name and no intervening characters are allowed between the initial ">" and the sequence name on the header line.
Detailed description of the FASTA format is available at NCBI.