But the rejective reaction of metanephroi of E20 rat and El4 and El6 mouse appeared obviously ten days after renal transplantation and aggravated gradually with embryonic age increasing.

• 胚龄20天的大鼠后肾和胚龄14、16天的小鼠后肾移植10天后，出现明显排斥反应，且随着胚龄的增长排斥反应逐渐加重。