PROTEASOME SUBUNIT BETA TYPE 4 PRECURSOR (EC 3.4.25.1) (PROTEASOME BETA CHAIN) (MACROPAIN BETA CHAIN) (MULTICATALYTIC ENDOPEPTIDASE COMPLEX BETA CHAIN) (PROTEASOME CHAIN 3) (HSN3) (HSBPROS26). [Source:SWISSPROT;Acc:P28070]