Direct active transport depends on four types of transport ATPases 4H1 胞外 胞内 ATP 2H* ADP+Pi ATP ADP+Pi ATP ADP+Pi ADP+Pi ATP P型泵 V型质子泵 F型质子泵 ABC超家族 The four classes of ATP-powered transport proteins: "P"type stands for phosphorylation; ABC(ATP-binding Cassette)superfamily. Two transmembrane(T)domains and two cytosolic ATP-binding (A) domains. This document is produced by trial version of Print2Flash.Visit www.print2flash.com for more information