The amount of a homocysteine-responsive endoplasmic reticulum-resident ubiquitin-like domain member 2 protein when measured in blood serum. The trait is Ontology of Biological Attributes entry OBA_2041859 (level of homocysteine-responsive endoplasmic reticulum-resident ubiquitin-like domain member 2 protein in blood serum). Also known as: blood serum homocysteine-responsive endoplasmic reticulum-resident ubiquitin-like domain member 2 protein amount.