The amount of a E3 ubiquitin-protein ligase SIAH1 (human) when measured in cerebrospinal fluid. The trait is level of E3 ubiquitin-protein ligase SIAH1 (human) in cerebrospinal fluid (Ontology of Biological Attributes entry OBA_2059653). Also known as: cerebrospinal fluid E3 ubiquitin-protein ligase SIAH1 (human) amount.