1·Molecular weight being 250, SD is a half antigen.
磺胺嘧啶的分子量为250，为半抗原。
2·Though the contribution to European DNA from Neanderthals is only about 6 percent, that small percentage accounts for half the observed human leukocyte antigen alleles.
虽然尼人遗传给欧洲人的DNA仅有6%，但是人类目前所发现的白细胞抗原等位基因中，有一半来源于尼人的贡献。