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 進(jìn)一步序列分析表明: as41 42 、 ts41 42與非爬行類脊椎動物的sox - 1 、 - 2 、 - 3的氨基酸同源性低于非爬行類脊椎動物包括哺乳類、鳥類、兩棲類和魚類的腸工一1 、一2 、一3相互之間的氨基酸同源性, 。