... natural and disulfide-mispaired, with the sequence of a-conotoxin SIwere described [53]. (Disulfide isomers: natural I-III, II- IV;mispaired ÔnestedÕ I-IV, II- III and mispaired ÔdiscreteÕ I -II, III-IV, ... informationfor ImIIA and Vc1.1, ImII, GIC and PIA, each of whichwas identified by prediction from a genomic DNA clone[7–10,22]. Comparison of the peptide sequences GID, EI,ImIIA, GIC and PIA suggests ... spectrometry and the lability of the sulfogroup in mass spectrometryanalysis allows recognition of the modification, and differentiation of sulfotyrosine and phosphotyrosine [38]. Characterization of the...