这种复杂动物，包括鱼类、鸟类、爬行动物和哺乳动物(如我们人类)，具有高度细化的免疫系统，这样的系统不会允许这些外来生物体在我们的细胞中生长。
This group of complex animals, which includes fish, birds, reptiles and mammals (like us humans) have highly specialised immune systems, which should not let these foreign organisms live in our cells.
介绍了外源核苷酸作为一种活性物质，对胃肠道的功能、肝脏生长与发育、脂质代谢、动物体免疫系统等具有重要影响。
As a kind of active substance, the exogenous nucleotides can affect the function of stomach and intestines, the development of hepar, the metabolism of lipid and the immune system of creature.
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