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GCs migrate into the sex cords of neonatal testes. Shown is a high-power (×60 objective) magnification of neonatal testes; note the presence of germ cells entering the sex cords (arrows). DAB signal represents those cells expressing neomycin phosphotransferase II after intraperitoneal injection of the MSCVneo-DsRed retroviral vector on gestational day 61.
