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# T-cells recognize only self?
Knowing that T-cells bind to MHC and evaluate antigen peptides presented on MHC, it is possible to get cause and effect backwards. The ability to experiment with T-cell receptors is less accessible than for B-cell receptors, antibodies, since T-cell receptors rely on MHC as an intermediary that presents antigen in the form of peptide fragments. While antibodies are routinely used in immunolabeling, and clearly bind non-self antigen in the body, T-cell receptors are much less directly observed, because their targets are confined to peptide fragments presented on MHC.
# Swarm-model of T-cell function, probabilistic antigen recognition
A probabilistic antigen recognition by T-cells, means that although a T-cell could occasionally learn to recognize non-self as self, and fail to identify the foreign invader, the majority of lymph cells will be conditioned to the majority of protein in the body, which is human cells, and inspection of antigen via MHC will probabilistically tend to recognize only self, encounters with the occasional dysfunctional T-cell will be a rare probability.