T Cells

T-helper cells are distinguished by the presence of CD4 on their surface and their ability to recognise peptides presented on MHC class II molecules. Their functions include promoting delayed-type hypersensitivity reactions, characterised by monocyte recruitment, and providing help for B-cell antibody production.

Cytotoxic T cells have CD8 on their surface and recognise peptide presented on MHC class I molecules.