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Premaxillae in Alizarin‐stained normally developing specimens of Pleurodeles waltl: (A) unipartite bone in larva at stage 47 [snout–vent length (SVL) 12.4 mm]; (B) start of separation at stage 48 (SVL 12.5 mm); (C) bipartite bones in metamorphosing animal at stage 55 (SVL 31.8 mm). Scale bars are 1 mm.
