The amount of a small ribosomal subunit protein eS4, X isoform (human) when measured in cerebrospinal fluid. The trait is Ontology of Biological Attributes entry OBA_2058316 (level of small ribosomal subunit protein eS4, X isoform (human) in cerebrospinal fluid). Also known as: cerebrospinal fluid small ribosomal subunit protein eS4, X isoform (human) amount.