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Immunohistochemistry of developing penises of 10-day postnatal mice stained for androgen receptor (AR), estrogen receptor alpha (ERα), and estrogen receptor beta (ERβ) as indicated. Abbreviations: PL=preputial lamina, MRGL=MUMP ridge groove lamina, MUMPCC=MUMP corpus cavernosum, CCUr=corpus cavernosum urethrae, CCG=corpus cavernosum glandis, Cart=MUMP cartilage. (a–c) are at the same magnification as are (d–f), see scale bars.
