| Specifies that a record should be written to search or
clustering output files if there are no hits for
the query sequence. By default, no records are written except for
uc files, which always have N (no-hit) records for
unmatched queries. A star (*) is written in place of the target label. Placeholders (zeroes or empty values) are written in other fields of the record. Supported in v7.0.1012 and later. |