91av在线播放-中文天堂-a级免费视频-男人午夜天堂-天天干天天操天天-91在线网址-gay瘦老头互吃xx-91麻豆精品国产-日韩成人综合-日本电影中文字幕-极品毛片-亚洲精选一区二区三区-特种兵之深入敌后-欧美一级在线播放-精品一区二区三区av-风韵少妇性饥渴推油按摩视频-男生和女生操操-日本福利在线-久久东京-国产伦精品一区二区三区视频我-欧洲成人免费视频-亚洲国产专区-18禁一区二区三区-18性xxxxx性猛交-北条麻妃青青久久-欧美日韩在线免费视频-亚洲欧美日本另类-无码国产精品久久一区免费-亚洲最新偷拍-天天综合色网

LCI產制滿足各種應用培養系統

　　Multistep paradigm for leukocyte recruitment
　　(a)Model of a post-capillary venule illustrating the four steps of leukocyte recruitment.These are(1)initial attachment(2)low-velocity rolling(3)arrest and activation of leukocyte integrin via locally expressed chemokines and(4)transmigration.(b)Fluid shear stress.In small venules,flow has been calculated as laminar shear stress with a parabolic velocity profile(minimum velocity at the vessel wall,maximum at the center line of the vessel).Fluid shear stress also can act directly on endothelial cells and T cells.(EC,endothelial cell;BM,basement membrane.)(Reprinted with permission from Alper,J.Searching for medicine's sweet spot.Science 291,2338?2243(2001).).Copyright American Association for the Advancement of Science.Original illustration by C.Cain,redrawn by B.Crimi.)