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A to F, OPT of 10.5-week penis in early stages of development with epithelium stained for E-cadherin. Continued proliferation (Ki67) in urethral plate (UP, opening zipper, G and H, high power k and L), open urethral groove (UG, red arrows) and fusion of urethral groove (I and M) to form tubular urethra (J and N). EB, erectile body. UM, urethral meatus.
