The rabbit immune system generates antibody diversity and optimizes affinity. GenScript utilizes MonoRab™ technology to generate high affinity and specific monoclonal rabbit antibodies. The HA tag is composed of several amino acids containing YPYDVPDYA and does not appear to interfere with the bioactivity or the biodistribution of recombinant proteins. GenScript MonoRab™ HA tag Antibody (109B2), mAb, Rabbit is specific to HA tags placed at the N-terminal, C-terminal, and internal regions of fusion proteins. This antibody can greatly improve the effectiveness of several different kinds of immunoassays, helping researchers identify and detect HA-tagged fusion proteins in bacteria, insect cells, and mammalian cells.