GNRH1 and osteoporosis: At birth: Normal genitalia, and serum AMH levels.  Normal serum basal and GnRH stimulated FSH levels at 2 months of age.  At 16 years: Tall stature, delayed bone maturation.  Normal virilization and testicular volume.  High serum basal testosterone, and normal serum basal gonadotropin levels.  Osteoporosis.