Abstract: Provided herein are antibodies that bind to a peptide of an N-terminally ubiquitinated polypeptide and methods of screening for such antibodies. Also provided herein are detection and enrichment methods using such antibodies for detecting or enriching a peptide of an N-terminally ubiquitinated polypeptide.

Abstract: Provided are CD8 binding agents comprising a VHH domain that specifically binds human CD8. Also provided are nucleic acids encoding such CD8 binding agents, vectors comprising such nucleic acids, host cells comprising same, and methods of making such CD8 binding agents. Also provided are CD8 binding agents having the VHH domain conjugated to a detectable label. Provided are methods of using such CD8 binding agents to detect CD8+ T cells, monitor disease progress, and monitor treatment progress in a subject having cancer, autoimmune disease or condition, transplant rejection or graft-versus-host disease.

Abstract: Provided herein are anti-KRas antibodies that bind to mutant KRas-GDP and alkylated mutant KRas-GDP and methods of using the same. Also provide herein are method of screening for KRas inhibitors and methods of measuring binding of KRas to the antibodies described herein.