 Each T cell can finally recognise only ten to hundreds copies of a unique sequence of a single peptide among thousands of other peptides presented on the very same cell because MHC molecule in one cell can bind quite a large range of peptides.Cytotoxic T cells (also known as Tc, killer T cell, or cytotoxic T-lymphocyte (CTL)) express CD8 coreceptors and are a population of T cells that are specialised for inducing programmed cell death of other cells.Cytotoxic T cells regularly patrol all body cells to maintain the organismal homeostasis.