PROTEASOME SUBUNIT BETA TYPE 9 PRECURSOR (EC 3.4.25.1) (PROTEASOME CHAIN 7) (MACROPAIN CHAIN 7) (MULTICATALYTIC ENDOPEPTIDASE COMPLEX CHAIN 7) (RING12 PROTEIN) (LOW MOLECULAR MASS PROTEIN 2). [Source:SWISSPROT;Acc:P28065]