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. 2016 Mar 4;6:22720. doi: 10.1038/srep22720

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(a) Chondrichthyan (catshark - Scyliorhinus canicula). (b) Non-teleost actinopterygian (paddlefish - Polyodon spathula). (c) Teleost (zebrafish - Danio rerio). (d) Tetrapod (mouse – Mus musculus). Endochondral skeleton in blue, dermal skeleton in gray. Anterior is left, distal is up for all figures. Figures not to scale.