The amount of a microtubule-associated protein 1 light chain 3 beta (human) when measured in cerebrospinal fluid. The trait is level of microtubule-associated protein 1 light chain 3 beta (human) in cerebrospinal fluid (OBA_2080862, an Ontology of Biological Attributes entry). Also known as: cerebrospinal fluid microtubule-associated protein 1 light chain 3 beta (human) amount.