with the efforts of generations of developmental biologists, detailed cell migration pathways in different kind of vertebrate embryos have been clarified, but unfortunately, mechanism underlying has been poorly known by now partially because of the uncertainty of the cellular events happening 由于組織不透明難以進行活體觀察。細胞運動是所有后生動物發(fā)育過程中都能觀察到的一種生命現(xiàn)象,闡明細胞運動機制對于形態(tài)發(fā)生機制的了解具有重要意義。