Ontology of Biological Attributes id OBA_2045142 (level of Phosphatidylethanolamine (18:1_18:1) in blood serum) is the amount of a PE(18:1_18:1) when measured in blood serum. Also known as: blood serum PE(18:1_18:1) amount, level of PE(18:1_18:1) in blood serum.