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胎儿胎盘单元只有一半基因与其母亲相同,故可看作是一种同种移植物,而妊娠则是一种天然移植现象。 1890年Heape作了关于胎儿同种移植物问题的最早研究。他把两个安哥拉兔受精卵转移到刚和同品系公兔交配后的比利时母野兔的输卵管里,结果母兔生产的一窝6只小兔中,有两只安哥拉兔。可见移植的安哥拉兔受精卵,在子宫内生存期间,并未受到义母的免疫排斥。
Only half of fetal placenta gene with its mother the same, it can be seen as a kind of allograft, and pregnancy is a natural transplant phenomenon. In 1890 Heape made the earliest studies on the problem of fetal allografts. He transferred two Angora rabbit zygotes to the fallopian tubes of Belgian female rabbits who had just mated with the same type of male rabbits. As a result, two Angora rabbits were found among six rabbits in a litter. Visible transplanted Angora rabbit zygotes, during the survival of the womb, not immune rejection by the mothers.