Table 1.

List of verbs used in PCorral split into groups defining the interaction type

Verbs denoting protein chemical modification	acetylate, acylate, amidate, brominate, biotinylate, carboxylate, cysteinylate, farnesylate, formylate, ‘hydrox[iy]late’, methylate, demethylate, ‘myristo?ylate’, ‘palmito?ylate’, phosphorylate, dephosphorylate, pyruvate, nitrosylate, sumoylate, ‘ubiquitin(yl)?ate’
Verbs denoting interaction and regulation events	associate, dissociate, assemble, attach, bind, complex, contact, couple, ‘(multi|di)meri[zs]e’, link, interact, precipitate, regulate, inhibit, activate, ‘down[-]regulate’, express, suppress, ‘up[-]regulate’, block, contain, inactivate, induce, modify, overexpress, promote, stimulate, substitute, catalyze, cleave, conjugate, disassemble, discharge, mediate, modulate, repress, transactivate

The verb forms are given in a regular expression form also including morphological variants of verb forms.