The amount of a HLA class II histocompatibility antigen, DR beta 3 chain (human) when measured in cerebrospinal fluid. The trait is OBA_2058385 (level of HLA class II histocompatibility antigen, DR beta 3 chain (human) in cerebrospinal fluid). Also known as: cerebrospinal fluid HLA class II histocompatibility antigen, DR beta 3 chain (human) amount.