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SSEA-4 is a marker of GCs compartmentalized within fetal sex cords. Representative photomicrographs of medium-power magnification (× 40 objective) showing distribution of SSEA-4-labeled GCs within fetal testes. Robustly labeled GCs were highly localized to the intracordal area of well-defined sex cords at all gestational ages. Fetal testes of gestational day 68 showed a slight increase in anti-SSEA-4-reactive GCs in the extracordal areas compared with other gestational ages.
