has_domain has value type value greater than zero but less than or equal to one search engine specific peptide sequence-level identification statistic distinct peptide-level combined FDRScore Combined FDRScore for peptides once redundant identifications of the same peptide have been removed (id est multiple PSMs have been collapsed to one entry) specifically obtained for distinct combinations of single, pairs or triplets of search engines making a given peptide, used for integrating results from these distinct pools. MS MS:1002361 search engine specific score for proteins