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Leydig's cells are a type of endocrine cell located in the testes, specifically in the interstitial tissue between the seminiferous tubules. Their primary function is the synthesis and secretion of testosterone, which is a key male sex hormone. Testosterone plays a crucial role in male reproductive development, influencing secondary sexual characteristics such as the growth of facial hair, deepening of the voice, and increased muscle mass.

The regulation of testosterone production is stimulated by luteinizing hormone (LH) from the pituitary gland, which binds to receptors on Leydig's cells, prompting them to produce this hormone. Overall, the biosynthesis and release of testosterone by Leydig's cells are vital for male fertility and sexual function.

Other options do not pertain to the function of Leydig's cells; they are produced in different tissues or by different cell types, which are not involved in the synthesis of testosterone.