BLAST Parameters

Sequence Format

Fasta:

A common sequence format offered by most sequence and alignment editors.

Fields definition:

A 'greater than' symbol followed by the sequence name, anything after the first hite space on the header line defines the description field. The following lines after a header line correspond to the sequence. Empty lines are not considered. Masked/unknown positions in the sequence are shown as 'N' or 'X', for nucleotide and protein sequences respectively.

Example:
>NM_001298896/1201-1440 - nucleotide sequence example (fragment)
TGGGCTCAATGCCGAGATGCGCTCAAACTTTCAGCTTATGCGTGCCATGAGCAGTTATAC
GCGAATGAACCCCAAACAACGCACTGATCGATTGCGCGCTTTTAACCACCGTTTACAAAA
CACTCCAGAAAGTGTGAAGGTCTTGAGAGACTGGAACATGGAACTGGACAAGAACGTCAC
AGAAGTACAAGGCCGGATAATTGGACAGCAGAACATCGTGTTTCATAATGGAAAGGTTCC

>PIWI_DROME/538-829  - aa sequence example (fragment)
LILCLVPNDNAERYSSIKKRGYVDRAVPTQVVTLKTTKNRSLMSIATKIAIQLNCKLGYT
PWMIELPLSGLMTIGFDIAKSTRDRKRAYGALIASMDLQQNSTYFSTVTECSAFDVLANT
LWPMIAKALRQYQHEHRKLPSRIVFYRDGVSSGSLKQLFEFEVKDIIEKLKTEYARVQLS
PPQLAYIVVTRSMNTRFFLNGQNPPPGTIVDDVITLPERYDFYLVSQQVRQGTVSPTSYN
VLYSSMGLSPEKMQKLTYKMCHLYYNWSGTTRVPAVCQYAKKLATLVGTNLH