Normal cells form similar, well-organized acinar structures in vitro, whereas in highly metastatic epithelial cell lines these structures are disorganized and lack polarity.

• 体外试验中，正常细胞形态相似，腺泡结构排列整齐，然而那些高侵袭的上皮细胞系的结构紊乱并且失去极性。