The function of TESK2 (testis associated actin remodelling kinase 2, Ensembl gene identifier ENSG00000070759) is as follows. Dual specificity protein kinase activity catalyzing autophosphorylation and phosphorylation of exogenous substrates on both serine/threonine and tyrosine residues. Phosphorylates cofilin at 'Ser- 3'. May play an important role in spermatogenesis.