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secreted by the adrenal medulla, derived from amino acid tyrosine; epinephrine and norepinephrine, water soluble
secreted by the thyroid gland, two derivatives of tyrosine bonded together; T4 and T3, lipophilic
fewer than 100 amino acids long, large and polar, cannot pass through membrane of target cell
common four ring structure of sterols, synthesized in adrenal cortex and gonads, cholesterol is a precursor, lipophilic
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