Serum protein electrophoresis showing a paraprotein (spike/peak in the gamma zone) in a patient with multiple<unk> . A<unk>  is an abnormal antibody (immunoglobulin) or (more often) a fragment thereof, such as an immunoglobulin light chain, that is produced in excess by an abnormal monoclonal proliferation of plasma cells, typically in multiple<unk> . Other terms for such a protein are monoclonal protein, M protein, M component, M spike, spike protein, or paraprotein. This proliferation of the<unk>  has several deleterious effects on the body, including impaired immune function, abnormally high blood viscosity ("thickness" of the blood), and kidney damage.
Myeloma protein
Promyelocytic leukemia protein
Mammaglobin
Retinoblastoma protein
Tumor antigen
Tumor-associated glycoprotein 72
Alpha-fetoprotein
Myelin