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Response of the gonadotropic axis to GnRH analogue injection. (a) Serum FSH (open circles), LH (filled circles), and FAS (closed triangles) concentrations measured at 4-hour intervals for 24 hours after injection of the GnRH analogue agonist triptorelin. (b) Serum testosterone measured at 4-hour intervals for 24 hours after injection of the GnRH analogue agonist triptorelin. Note the logarithmic scale. The shaded area indicates the normal range of testosterone values in adult men.
