The amount of a peptidyl-prolyl cis-trans isomerase A-like 4D (human) when measured in cerebrospinal fluid. The trait is level of peptidyl-prolyl cis-trans isomerase A-like 4D (human) in cerebrospinal fluid (OBA_2055894). Also known as: cerebrospinal fluid peptidyl-prolyl cis-trans isomerase A-like 4D (human) amount.