Psychology Ontology	Placental Cell Type	Source
http://ontology.apa.org/apaonto/termsonlyOUT%20(5).owl#Stem_Cells	https://pat.nichd.nih.gov/placentalcelltype/CT.07	LOOM
http://ontology.apa.org/apaonto/termsonlyOUT%20(5).owl#Natural_Killer_Cells	https://pat.nichd.nih.gov/placentalcelltype/CT.02.05.01	LOOM