Labs from around the world send the runners-whatever sort of mammalian cell they think will do well-to one of six testing sites .
世界各地的实验室选送赛跑选手任何他们认为会成功的哺乳动物细胞去六个赛场中的一个。
Initial mammalian cloning experiments , with sheep and other species , have produced many sickly offspring that die quickly .
最初用羊及其它哺乳动物进行的克隆实验,已经产生了许多很快死去的不健康后代。
Fortunately , scientists can now study individual mammalian neurons in living brains , by making neurons fluoresce using genetic engineering .
幸运的是,科学家现在能够应用基因工程使神经元发放荧光从而在活体上研究哺乳动物的单独一个神经元。
Researchers in japan have made fertile mammalian sperm in a culture dish , a feat long thought to be impossible .
日本的研究者在培养皿中培育出了有繁殖能力的哺乳动物的精子,这在长久以来都被认为是不可能实现的。
And finally , too much stimulation of the brain 's sex and mating circuitry obstructs the mammalian instinct toward monogamy .
最后,对大脑的性爱/交配回路的过多刺激,将有碍哺乳动物的一夫一妻制天性。
But this kind of thinking presented a serious problem for neurobiologists trying to figure out the evolutionary origins of the mammalian cortex , he said .
但是,这类认识为想要探明哺乳动物大脑皮质的进化源头的神经生物学家设下了一个难题,卡特说。
Mammalian cells make only the single-stranded variety . If a cell 's defence mechanisms detect double-stranded rna they destroy it , to protect against infection .
And last year , researchers in australia reported what would be the world 's first mammalian extinction of modern times : the lemuroid ringtail possum .
并且在去年,澳大利亚的研究人员报告称,将成为现代世界首度出现灭绝的哺乳动物会是狐猴浣熊和负鼠。
But because the sialic acid found in birds is chemically different from that in mammals , and because bird flu has evolved to recognise only the avian variety , it cannot stick easily to mammalian cells , limiting its ability to infect people .