Elsevier Inc. Pol X members ---- Xrcc6 Pol X members ---- Xrcc5 Pol X members Aplf ---- Xrcc4 Aplf Prkdc Dclre1c Prkdc ---> Dclre1c Dclre1c ---- Prkdc Xrcc5 --+> Prkdc Xrcc6 --+> Prkdc Xrcc6 Xrcc5 Aptx Rif1 Tp53bp1 Pnkp ---- Xrcc4 Aptx ---- Xrcc4 Xrcc4 Pnkp ataxia telangiectasia-mutated (ATM) signaling pathway Nhej1 ---- Xrcc4 Nhej1 Lig4 ---- Xrcc4 Lig4 Prkdc ---- Xrcc6 Prkdc ---- Xrcc5 Rif1 ---- Tp53bp1