Immunogen sequence: GQKQDTPVRR GRTLRSMASG EDVVLPQRAP QGQPQMLTAL WYRRQRLLAR TLRLWFEKSS RGQAKLEQRR QEEALERK Highest antigen sequence identity to the following orthologs: Mouse - 86%, Rat - 88%. Specifically deubiquitinates histone H2B at 'Lys-120' (H2BK120