7、AMPvarydependingonthetargetcell.答:7. Itisthoughtthatextracellularligandbindingtoareceptortyrosinekinaseactivatestheintracellularcatalyticdomainbypropagatingaconformationalchangeacrossthelipidbilayerthroughthesingletransmembrane a helix.答:8. Atrialnatriureticpeptides(心钠肽)b