Comparative observation with light microscopy and scanning electron microscopy shows: the hatching gland occurs at stage of embryo development.
观察结果表明，胚胎发育期有孵化腺发生。
Comparative observation with light microscopy and scanning electron microscopy shows: the hatching gland occurs at stage of embryo development.
观察结果表明，胚胎发育期有孵化腺发生。
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