MICB (MHC Class I Polypeptide-Related Sequence B): MICB is a stress-induced ligand for the NKG2D receptor, which is found on natural killer (NK) cells, CD8+ T-cells, and certain γδ T-cells. The interaction between MICB and NKG2D is crucial for immune surveillance, helping the body identify and destroy malignant or infected cells. Increased expression of MICB on stressed, transformed, or infected cells can trigger an immune response, resulting in targeted cell elimination. Therefore, MICB plays a vital role in the defense against cancer and viral infections.