ERCC2 and xeroderma pigmentosum: On the other end, showing the strongest negative correlations were the pairs of P2RY12 (Purinergic Receptor P2Y, G-Protein Coupled, 12)–ERCC2 (Excision Repair Cross-Complementing Rodent Repair Deficiency, Complementation Group 2) (−0.91), ADRB2–HDAC2 (Histone Deacetylase 2) (−0.88), GPR84–XPA (Xeroderma Pigmentosum, Complementation Group A) (−0.87), P2RY12–HDAC2 (Histone Deacetylase 2) (−0.86), and PPARGC1B–NONO (Non-POU Domain Containing, Octamer-Binding) (−0.84).