Fig3A(left). Copyright: Reprinted with permission from Elsevier from [doi:10.1006/dbio.2001.0382] Dev Biol 237: 345-53, Bruneau S; Johnson KR; Yamamoto M; Kuroiwa A; Duboule D, The mouse hoxd13(spdh) mutation, a polyalanine expansion similar to human type ii synpolydactyly (spd), disrupts the function but not the expression of other hoxd genes. Copyright 2001