在生理温度下,甾体激素容易进入所有细胞。在激素敏感的细胞中,激素结合到细胞质中的可溶性大分子而保留下来(见图)。这些可溶性结合分子称作细胞质受体[Cytosolreceptors(Rc)],但它们在体内真正的性质尚不清楚,并似乎是由两个或两个以上的亚单位组成的大分子蛋白质。甾体激素初始的作用包括激素进入靶细胞,在那里被识别,并被细胞质受体结合,这种受体对于某 At physiological temperatures, steroid hormones readily enter all cells. In hormone-sensitive cells, hormones are retained by the soluble macromolecules in the cytoplasm (see figure). These soluble binding molecules are termed Cytosol receptors (Rc) but their true in vivo properties are not clear and appear to be macromolecular proteins made up of two or more subunits. The initial effects of steroid hormones include the entry of hormones into target cells, where they are recognized and bound by cytoplasmic receptors that