Methods Rat embryos with ARM were generated by administration of ethylenethiourea (ETU) to pregnant mice ( n =21).

• 方法 用乙烯硫脲 (ethylenethiourea ,ETU)致畸 2 1只孕鼠共生产泄殖腔畸形和无肛畸形胎鼠(2 0 4只 )。