面临感染时，它们向问题细胞发出信号，来调节特殊基因的表达与不表达。
They do so by feeding the cells in question signals that cause them to switch particular genes on or off in response to infection.
糖作为信号分子，调节了承担糖运输与代谢的基因的表达。
Sugars as signal molecules regulate the expression of genes involved in sugar transport and metabolism.
肿瘤是一种基因疾病，在当前分子生物学领域中，细胞癌变与细胞信号传导系统、细胞周期调控、细胞的生长和分化，以及细胞凋亡等均有关联。
Tumor is a kind of gene disease in the field of molecular biology, canceration is correlated with signal transduction system, regulate of cell cycle, differentiation and development of cell apoptosis.
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