The 'Hormone Melanocyte-Stimulating Hormone' (MSH) in humans is primarily derived from the cleavage of a larger precursor protein called:
A. Prothrombin
B. Proinsulin
C. Pro-opiomelanocortin (POMC)
D. Prorenin
Answer: Option C
Solution (By JKSSB Mock Tests)
In humans, the intermediate lobe of the pituitary is rudimentary, and most Melanocyte-Stimulating Hormone (MSH) is produced in the anterior lobe (pars distalis). It is not synthesized as a separate hormone but is derived from the proteolytic cleavage of a large precursor polypeptide called pro-opiomelanocortin (POMC). POMC is cleaved to produce several biologically active peptides, including Adrenocorticotropic Hormone (ACTH), beta-lipotropin, beta-endorphin, and various forms of MSH (alpha, beta, gamma).
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