The head of the sperm carries special enzymes to dissolve this membrane , which it must do in order to fertilise the egg .
精子頭部攜帶某種特殊的溶解酶,消融防護細胞棕色的外膜,唯有如此,受精方可成功。
Even if hedid fertilise the egg of a non-paired female it would not survive as ittakes two adults to raise a single chick .
即使雄鳥讓單身的雌鳥產下了受精卵,但如果沒有兩只成年鳥的照顧雛鳥將無法生存。
The ' artificial sperm ' were then used to fertilise eggs , leading to the birth of 60 ' grossly healthy ' baby mice , who went on to have families of their own , the journal cell reports .