"Our bodies have essentially two ways of solving the organizational problems raised by coordinating billions of semi-independent cells. In hormonal systems, master control cells broadcast potent signals all other cells must obey. Steroid hormones like estrogen or testosterone enter the body's cells, penetrating their nuclei and directly controlling gene expression. The endocrine system is like an immensely powerful dictatorship, issuing sweeping edicts that all must obey."
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