PROTEASOME ACTIVATOR COMPLEX SUBUNIT 2 (PROTEASOME ACTIVATOR 28-BETA SUBUNIT) (PA28BETA) (PA28B) (ACTIVATOR OF MULTICATALYTIC PROTEASE SUBUNIT 2) (11S REGULATOR COMPLEX BETA SUBUNIT) (REG-BETA). [Source:SWISSPROT;Acc:Q9UL46]