Immunoglobulin genes are a crucial part of the immune system, providing the body with antibodies to fight off infections and diseases. These genes are also known as antibody genes or B Cell Receptor genes. They are responsible for producing the various types of immunoglobulins or antibodies needed to bind and neutralize specific foreign substances, such as bacteria, viruses, or toxins in the body. Other synonyms for "immunoglobulin gene" include B lymphocyte antigen receptor gene, B cell receptor gene, and antibody heavy-chain gene. These terms all refer to the same set of genes that are vital to the body's defense against infection and disease.