MicroCT transverse sections of embryos showing lung lumina.

<p>Sections are of <i>Pantherophis guttata guttata</i> (A – D) and <i>Elaphe obsoleta spiloides</i> (E). The embryo's dorsal sides are up. Astral blue arrows denote right lung, dark yellow left lung; V = ventricle; OFT = outflow tract. Annotation done in Amira 5.4.5. Scale bar represents 1 mm.</p>