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. 2018 Oct 18;302(1):32–48. doi: 10.1002/ar.23914

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© 2018 The Authors. The Anatomical Record published by Wiley Periodicals, Inc. on behalf of American Association of Anatomists.

This is an open access article under the terms of the http://creativecommons.org/licenses/by-nc/4.0/ License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.

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Dorsal mesenchymal protrusion in a lizard. (A) In the embryonic green anole lizard (Anolis carolinensis, Sanger (Sanger et al., 2008) stage 7), Ils1 is expressed in the dorsal mesenchymal protrusion (negative for the sarcomeric protein tnnt2, save a few noticeable specks) on the left of which is the pulmonary vein (pv) as in mammals. (B) Schematized sagittal section of the heart with the same principal components as in eutherian mammals (Fig. 2B’). 1, primary septum; 2, mesenchymal cap; 4, atrioventricular cushions; d, dorsal mesocardium; D, dorsal mesenchymal protrusion; LA, left atrium; RA, right atrium; V, ventricle.