Antibodies, or immunoglobins (Ig), are glycoproteins produced by mammalian white blood cells, more specifically B-lymphocytes, to elicit an immune response. They bind to proteins (antigens) on the surface of pathogenic organisms e.g. bacteria, viruses, fungi, parasites, targeting them for destruction by the immune system. Antibodies recognise specific epitopes on the surface of the pathogen allowing the antibodies to either neutralise the foreign entity or facilitate further immune responses.