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Steroidogenic Acute Regulatory Protein

Meaning

Steroidogenic Acute Regulatory Protein, StAR, is a mitochondrial protein governing the initial, rate-limiting step in steroid hormone biosynthesis. It facilitates cholesterol movement from the outer to the inner mitochondrial membrane, an indispensable process for producing all steroid hormones, including glucocorticoids, mineralocorticoids, and sex steroids.