The amount of a serine/threonine-protein kinase tousled-like 1 when measured in blood serum. The trait is Ontology of Biological Attributes id OBA_2043863 (level of serine/threonine-protein kinase tousled-like 1 in blood serum). Also known as: blood serum serine/threonine-protein kinase tousled-like 1 amount.