It depends on which PIR format - I have written an SRS parser for PIR's CODATA format (common in US), but I would guess you need one for the NBRF format (common in Europe). (see http://iubio.bio.indiana.edu/srs/ for former). - Don -- -- d.gilbert--bioinformatics--indiana-u--bloomington-in-47405 -- gilbertd at bio.indiana.edu