Merck, F0767-.5ML, Anti-Human IgG1−FITC antibody, Mouse monoclonal

Human IgG consists of four subclasses (1-4) that can be recognized by antigen differences in their heavy chains. They constitute approximately 65, 30, 5 and 4% of the total IgG respectively. Each subclass has different biological and physiochemical properties. The IgG subclass may be preferentially produced in response to different antigens. For instance, antipolysaccharide responses are mainly of the IgG2 subclass, while protein antigens give rise to IgG1 and IgG3 antibodies. Lipopolysaccahrides stimulate an IgG2 response in PBL′s and an IgG1 response in the spleen. Human IgG1 is the predominant subclass of in vivo and in vitro produced anti-tetanus toxoid antibodies.