Mammalian prolactin is secreted by

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(A) The pituitary gland is divided into two main parts: the $Adenohypophysis$ (anterior pituitary) and the $Neurohypophysis$ (posterior pituitary).$1$

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Adenohypophysis

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(A) The pituitary gland is divided into two main parts: the $Adenohypophysis$ (anterior pituitary) and the $Neurohypophysis$ (posterior pituitary).$1$. $Adenohypophysis$: It secretes several hormones including Prolactin $(PRL)$, Growth Hormone $(GH)$, Thyroid Stimulating Hormone $(TSH)$, Adrenocorticotropic Hormone $(ACTH)$, Luteinizing Hormone $(LH)$, and Follicle Stimulating Hormone $(FSH)$. Prolactin is specifically responsible for regulating the growth of the mammary glands and the formation of milk in them.$2$. $Neurohypophysis$: It stores and releases two hormones, Oxytocin and Vasopressin $(ADH)$, which are synthesized by the hypothalamus.$3$. $Adrenal 	ext{ } cortex$: It secretes glucocorticoids (like cortisol) and mineralocorticoids (like aldosterone).$4$. $Adrenal 	ext{ } medulla$: It secretes catecholamines like adrenaline (epinephrine) and noradrenaline (norepinephrine).Therefore, prolactin is secreted by the $Adenohypophysis$.

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