Isoprinosine and muramyl dipeptide (MDP) could promote animal immune function, and prolong the sleeping time of mice and rabbits.

异斯皮洛宁和鼠基二肽（MDP）可以促进动物的免疫功能，并延长小鼠和兔子的睡眠时间。

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Isoprinosine, transfer factor and muramyl dipeptide(MDP) could promote animal immune function, and prolong the sleeping time of mice and rabbits.

异丙肌苷、转移因子、胞壁酰二肽（MDP）在增强动物免疫功能的同时，均能延长动物的慢波睡眠时间。

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That works, but imposes a burden on the animal, since materials and energy have to be diverted to the boosted immune system.

那样是行得通的，但会对动物产生不良影响，因为物力和精力不得不转向提高蚊子免疫系统方面的研究。

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Dr Hertig speculates that some of these genes may have been picked up from retroviruses and that they could be important in persuading animal immune systems to leave the pox virus alone.

ECONOMIST: Foulpox

Through further experiments in human cells and animal studies the researchers found that a protein called NF-kB lured zinc into the immune cells that responded fastest to fight infection.

BBC: Zinc 'keeps immune system in check'