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[A study on the relationships among plasma testosterone, sex development and serum zinc in normal boys aged 10-15].

The plasma testosterone and serum zinc of 123 normal boys, aged 10-15 were measured and compared with their sex development in stages. The results showed: concentrations of plasma testosterone, serum zinc and other indicators of sex development increased along with age and stage of sex development. There was positive correlation between levels of plasma testosterone and serum zinc and the development of testicles and penis.