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.

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问题关键在于找到正确的诱导干细胞分化成心脏细胞，神经细胞，制造胰岛素的细胞或者其他细胞的生长因子的正确方法。

The key lay in finding just the right recipe of growth factors and nutrients to induce a stem cell to become a heart cell, a neuron, an insulin-making cell or something else.

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但这一个非常现实的问题，它的名字是胰岛素样生长因子- 1 (IGF - 1)。

But there is a very real problem, and its name is Insulin-like Growth Factor-1 (IGF-1).

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