Cytoplasmic Transporter Spokes Cytoplasmic nng filaments Cytoplasmic carticles Nuclear lamina Figure 12.6 A model of the nuclear pore complex cytoplasmic ring has been cut open to reveal the trans- NPC).(a)A three-dimensional representation of the NPC porter.The translocation of materials through the complex s it is situated within the nuclear envelope.This elaborate is described in Figure 12.7.(b)A three-dimensional model ucture contains about 100 different polypeptides(called based on high-resolution electron microscopy showing the uceoporins)and consists of several parts,including a nuclear pore complex as it would appear from the cyto- poke-ring assembly(two yellow rings and rose-colored plasm.(a:After Christophter W.Akey and Michael Radermacher pokes),a nuclear basket that resembles a fish trap,a central J.Cell Biol.122:15,1993;by copyright permission of the Rocke- plug"or transporter,and eight cytoplasmic filaments.The feller University Press:b:courtesy of Christopher Akey.) 主讲：汤华 15 主讲：汤 华 15