Written by the Fiveable Content Team • Last updated September 2025
Written by the Fiveable Content Team • Last updated September 2025
Definition
IgG stands for Immunoglobulin G, which is the most common type of antibody found in blood circulation. It plays a crucial role in the body's immune response by identifying and neutralizing pathogens such as viruses and bacteria.
Related terms
B: lymphocytes - White blood cells that produce antibodies, including IgG, as part of the adaptive immune response.
Antigen: Any substance that triggers an immune response, leading to the production of antibodies like IgG against it.
A highly specific immune response that adapts to recognize and remember specific pathogens, involving mechanisms such as the production of antibodies by B-lymphocytes