The amount of a mitogen-activated protein kinase kinase kinase kinase 1 (human) when measured in cerebrospinal fluid. The trait is level of mitogen-activated protein kinase kinase kinase kinase 1 (human) in cerebrospinal fluid (OBA_2080214). Also known as: cerebrospinal fluid mitogen-activated protein kinase kinase kinase kinase 1 (human) amount.