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sequence labels
Sequence labels are strings of text following a greater-than (>) symbol at the start of a line in a FASTA file or the @ symbol at the start of a read in a FASTQ file. The label is terminated by the end of the line.

By default, the complete label is stored and reported, unlike BLAST which truncates labels at the first white space (blank or tab). You can use the -trunclabels option to specfiy that labels should be truncated.

Labels may contain annotations, i.e. information about the sequence. This simplifies tracking of data which would otherwise require multiple files which would have to be kept in synch with the sequences. For examples, see size annotations, sample identifiers and OTU identifiers.