Ready-to-use ELISA kits are available for the detection of KRR1, small subunit (SSU) processome component, homolog (yeast), an alias of the protein, KRR1 small subunit processome component homolog. The official gene symbol is KRR1. The protein, with a mass of 43.7 kDa and length of 381 residues, is reported to be cytoplasmic and nuclear. It is a member of the KRR1 family and may be known by other names, including: HRB2, rev-interacting protein 1, KRR-R motif-containing protein 1, HIV-1 rev binding protein 2, and HIV-1 Rev-binding protein 2.