我的認知是pull down是想用bead把A protein抓下來, 然後看B protein和A之間有沒有physical interaction(direct interaction)(by anti-B Ab)

Co-IP通常會在細胞裡面做, 用anti-A Ab抓下A, 再用anti-B Ab看兩者之間是否有interaction(direct or indirect)

喔~我懂了~你好厲害喔鳥蛋!!