研究人员发现了一些人已经发生了极少量的基因变异，这种变异减少了细胞对某种生长激素（即，胰岛素样生长因子1（IGF1)）的使用。
Researchers have discovered that some people have a rare genetic mutation that decreases their cells' use of a particular growth hormone: insulin-like growth factor 1 (IGF1).
奶牛和人一样，也能在生长激素的作用下分泌类胰岛素生长因子，这种蛋白质被释放到血液里，从而进入到牛奶中。
Cows, like humans, produce insulin-like growth factor in response to growth hormones and release it into the blood, and the protein makes its way into their milk.
目的研究生长激素和胰岛素样生长因子对小儿免疫系统发育的调节作用及其机制。
Objective to study the effect of growth hormone and insulin-like growth factor on development of the immune system in childhood.
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