highly significantP =1.0 × 10 -125
Compared to size-matched random genomic regions, K122Q-bound enhancers showed highly significant enrichment of the canonical CRE motif (Fold Enrichment=13.7, P =1.0 × 10 -125 ), with 42.5% of enhancers containing the motif versus 3.1% of background regions ( Supplementary Fig. 2 ).