Protein kinase which plays an important role in the G2/M checkpoint response to DNA damage. Controls degradation of CDC25A by directly phosphorylating it on residues whose phosphorylation is required for BTRC-mediated polyubiquitination and degradation. {ECO:0000269|PubMed:12154088, ECO:0000269|PubMed:19734889, ECO:0000269|PubMed:20090422}. This is the function of NEK11 (NIMA related kinase 11, Ensembl gene identifier ENSG00000114670).