Name:	extension
Synonyms:	yolk extension
Definition:	The posterior elongated region of the yolk cell that forms during the segmentation period.
Ontology:	Anatomy Ontology [ZFA:0000106]

Name:	iron atom
Synonyms:	26Fe, Eisen, Fe, fer, ferrum, hierro, Iron
Definition:	An iron group element atom that has atomic number 26.
Ontology:	ChEBI [CHEBI:18248] ( EBI )