| Namespace | MPheno.ontology | Obsolete | false |
| description | any structural anomaly of the primitive endoderm-derived tissue which remains in contact with and surrounds the extra-embryonic ectoderm and the epiblast and provides signals for the differentiation and patterning of the epiblast; a small number of visceral endoderm cells also contribute to the endoderm of the embryonic gut |
