The amount of a ubiquitin-conjugating enzyme E2 Z (human) when measured in cerebrospinal fluid. The trait is level of ubiquitin-conjugating enzyme E2 Z (human) in cerebrospinal fluid (OBA_2081023, an Ontology of Biological Attributes entry). Also known as: cerebrospinal fluid ubiquitin-conjugating enzyme E2 Z (human) amount.