Updated FTP location. Immunoprecipiated sample using rabbit anti-His-GST (negative control) and rabbit anti-LSA3-C serum were separated by SDS-PAGE under reducing conditions. Protein bands around 300 kDa were excised for MS analysis. PMFs derived from the 2 samples were compared, then peptides specifically detected from anti-LSA3-C pull down sample were subjected to database search (MS-Fit).