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How to sign: the secretion of an endocrine gland that is transmitted by the blood to the tissue on which it has a specific effect
Similiar / Same: endocrine, internal secretion
Within this category: adrenocorticotropic hormone, adrenosterone, catecholamine, epinephrine, gastrin, ghrelin, glucagon, glucocorticoid, gonadotropin, insulin, melanocyte-stimulating hormone, melatonin, neurohormone, oxytocin, parathyroid hormone, relaxin, releasing hormone, secretin, somatotropin, steroid hormone, thymosin, thyroid hormone, thyrotropin, thyrotropin-releasing hormone, vasopressin