XRCC4 (Arabidopsis thaliana homolog of human DNA ligase IV-binding protein XRCC4). Identical to DNA-repair protein XRCC4 (XRCC4) [Arabidopsis Thaliana] (GB:Q682V0;GB:Q9LS81); similar to tolA protein-related [Arabidopsis thaliana] (TAIR:AT1G61410.1); similar to XRCC4 homolog [Populus nigra] (GB:BAF03494.1); contains InterPro domain Carbamoyl phosphate synthetase, large subunit, ATP-binding; (InterPro:IPR005479); contains InterPro domain DNA double-strand break repair and VJ recombination XRCC4, C-terminal; (InterPro:IPR014751)