The FASTA sequence file format is widely supported by
bioinformatics tools. For a detailed description, see this Wikipedia entry about
USEARCH allows lines of any length in
a FASTA file. (Some programs limit lines to e.g. 80 characters).
USEARCH does not support comments in FASTA
White space characters (blanks and tabs)
are discarded if found in sequence data, but many other tools do
not allow this and the practice is not recommended.
If the -trunclabels option is given, USEARCH will truncate
sequence labels at the first white space (similar to BLAST), otherwise the
full label is retained..