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action on Sertoli cell, thereby resulting in decreased production of inhibin

B. Therefore, genetic analysis is required for a defi nitive diagnosis in the index

patient (Fig. 9.18 ).

a

c

b

d

Fig. 9.18 ( a ) A 20-year-old individual with poor facial hair growth. ( b ) Tanner pubic hair stage
P 4 , bilateral scrotal testes ( c , d ) microphallus, ventral–urethral groove, and penile hypospadias

9 Disorders of Sex Development