Fig. 7. Docking and fusion. Vam3, Vam7, Vti1 and Ykt6 are members of the SNARE family, proteins that function in membrane fusion in a variety of cellular contexts. Ypt7 is a member of the Rab small GTPase family, whose members are again implicated in many instances of membrane fusion. Also shown is the class C Vps/HOPS complex and two proteins recently shown to play a role in the fusion process, Ccz1 and Mon1.