passages.id: split_5_test_410_passage
passages.type: progene_text
passages.text: The data are consistent with an asymmetric mechanism of CheA activation [ Levit , M. , Liu , I. , Surette , M. G. , and Stock , J. B. ( 1996 ) J. Biol. Chem. 271 , 32057 - 32063 ] wherein only one phosphoaccepting domain of CheA at a time can interact with an active center within a CheA dimer .