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Sexually dimorphic expression of FLK1 during CC development. (A–J) The expression of FLK1 in the male (upper panels) and female CCs (lower panels) at E16.5, E18.5, PND3, PND7, and PND21. In all immunofluorescent panels, Hoechst 33342 (blue) marks nuclei. White dotted lines indicate the outer region of the CC (tunica albuginea). Scale bar: 100 µm.
