Effect of androgen on the expression of IVD and androgen receptor (AR) in the Harderian gland of golden hamsters. Golden hamsters (8 weeks old) were injected subcutaneously with 5 mg/kg of testosterone enanthate and Harderian glands were obtained after indicated time. Total RNA was extracted from them and mRNA was amplified by reverse transcription-polymerase chain reaction (RT-PCR) with specific primers for IVD, androgen receptor (AR), and beta-actin. Representative ethidium bromide-stained gels are shown. Castration of male hamsters was done 2 weeks before injection. Lane 1, male; lanes 2 to 4, castrated male; lane 2, 0 day; lane 3, 3 days, lane 4, 7 days after injection.