通过单因子试验，筛选了用作发酵剂制作的最佳碳源为葡萄糖，最佳氮源为蛋白胨，生长促进因子为番茄汁。
Fermentation experiment indicated: the optimum carbon source was glucose, the optimum nitrogen source was peptone, growth factor was tomato juice.
简而言之，这种化学因子或蛋白质既能繁殖这些细胞又能使该细胞保持促进头发生长的活力。
The long and short of it is that being able to multiply these cells while preserving their efficacy opens the way for unlimited supplies of head hair.
表皮生长因子受体通常促进细胞的生长发育，一旦发生基因变异，会使细胞不受控制地生长。细胞不受控制地生长，这正是癌症的特征。
EGFR normally promotes cell growth and development, and when mutated, allows the uncontrolled growth of cells that is the hallmark of cancer.
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