small intestine
http://purl.obolibrary.org/obo/UBERON_0002108
http://purl.obolibrary.org/obo/UBERON_0000160
UBERON:0002108
http://purl.obolibrary.org/obo/UBERON_0004921
http://purl.obolibrary.org/obo/UBERON_0013765