Ontology of Biological Attributes term OBA_2042822 (level of retinal rod rhodopsin-sensitive cGMP 3',5'-cyclic phosphodiesterase subunit delta in blood serum) is the amount of a retinal rod rhodopsin-sensitive cGMP 3',5'-cyclic phosphodiesterase subunit delta when measured in blood serum. Also known as: blood serum retinal rod rhodopsin-sensitive cGMP 3',5'-cyclic phosphodiesterase subunit delta amount.