IgG3 Isotype Control (clone COLIS41B)

Antibodies can come in different varieties known as isotypes or classes. In humans there are five antibody classes known as IgA, IgD, IgE, IgG, and IgM. IgG provides the majority of antibody-based immunity against invading pathogens and is the only antibody capable of crossing the placenta to give passive immunity to the fetus.