The amount of a dual specificity mitogen-activated protein kinase kinase 3 (human) when measured in cerebrospinal fluid. The trait is level of dual specificity mitogen-activated protein kinase kinase 3 (human) in cerebrospinal fluid (OBA_2057893, an Ontology of Biological Attributes identifier). Also known as: cerebrospinal fluid dual specificity mitogen-activated protein kinase kinase 3 (human) amount.