I believe the answer is different versions of a gene :)
The answer would be: anterior pituitary
Hypothalamus secretes many hormones that will bind to anterior pituitary and makes it secretes many kinds of tropic hormones. Anterior pituitary able to secrete gonadotropic, somatotropic, thyrotropic, lactotropic, or corticotropic hormones. All these hormones will have to travel to their specific endocrine glands.
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Answer:
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