missing artery
Absence of artery.
http://purl.obolibrary.org/obo/XPO_0124851
http://purl.obolibrary.org/obo/UPHENO_0008752
http://purl.obolibrary.org/obo/XPO_0124762
http://purl.obolibrary.org/obo/XPO_0100076