Morphometric analysis of distal penile tip to urethral flap length in perinatally DES-treated and mutant mice expressed as absolute length (A & D) or normalized to surrogates of penile length (B, C, E, F). Significance symbols (*, # and +) when depicted in blue indicate normalization to CD-1 mice and in red when normalized to C57BL/6 mice. ✚ = p ≤ 0.05, # = p ≤ 0.001 and ✱= p ≤ 0.0001.