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In situ hybridization with SOX9 on autopods of Talpa occidentalis , Cryptotis parva and Mus musculus . Right hands and feet are in dorsal view, except for O-P, which are left hand and foot in palmar and plantar view, respectively [4]. Images E-N and Q-R were mirrored to make the orientation consistent. Roman numbers indicate digits. Age determination: early 17 d (A-B), 18d (C-D), 19d (E-F), 13.5d (G-H), 15.5d (I-J), 17.5d (K-L), 12.5d (M-N), 13.5d (O-P), and 14.5 d (Q-R).
