The unexpected sequence change in ts - 41 , - 42 and , as - 41 , - 42 may have occurred after divergence of amniotes . it is the first report that the sequence homologues of the progenitor of the mammalian testis - determining gene sry were identified in reptile . these findings might provide molecular evidences that sry - related genes may be involved into tsd 进一步序列分析表明： as41 42 、 ts41 42与非爬行类脊椎动物的sox - 1 、 - 2 、 - 3的氨基酸同源性低于非爬行类脊椎动物包括哺乳类、鸟类、两栖类和鱼类的肠工一1 、一2 、一3相互之间的氨基酸同源性， 。
