passages.id: split_1_test_1402_passage
passages.type: progene_text
passages.text: Although there are significant homologues relating to a pheromone - binding surface protein ( TraC ) and a negatively regulating protein ( TraA ) , there is an absence of a determinant equivalent to traB of pAD1 ( reduces endogenous pheromone ) and a determinant for surface - exclusion protein .