Figure 1. Processes that could regulate TRG co‐expression.

(1) Stochastic: Gene co‐expression is a fully stochastic process; (2) maturational stage: co‐expression is driven by mTEC maturation stages; (3) re‐use: co‐expression is driven by re‐use of existing tissue‐restricted programmes of gene expression; (4) physical co‐location: co‐expressed genes are in close physical proximity.