ends during starts during anatomical region thoracic region XAO:0005163 xenopus_anatomy eriksegerdell A region of the embryo that is located broadly around the heart, but ventral to the pharyngeal region, posterior to the cement gland, and anterior to the endoderm or organs of endodermal origin (foregut, liver and lung primordia). 2016-11-16T18:07:16Z NF stage 28 NF stage 44