IgM vs. IgG3: The term may conflate IgM (Immunoglobulin M) and IgG3 (Immunoglobulin G subclass 3), two distinct antibody classes with well-characterized roles:
TIM-3: T cell immunoglobulin and mucin domain-containing protein 3 (TIM-3), an immunoregulatory receptor studied in cancer immunotherapy . While not an antibody itself, it is a therapeutic target for monoclonal antibodies (e.g., anti-TIM-3 mAbs like RMT3-23) .
IgMAT: A bioinformatics tool for annotating antibody sequences across species, not an antibody itself .
Antibody Engineering: Technologies like single-cell sequencing enable the discovery of antibodies targeting glycan epitopes or conserved viral regions .