Regulating actin dynamics through cofilin dephosphorylation is the role of a newly identified phosphatase, chronophin, a member of the haloacid dehalogenase (HAD) superfamily. Chronophin, the second cofilin phosphatase to be identified, has high phosphoprotein specificity towards cofilin, but curiously it was also discovered independently as a pyridoxal phosphate (vitamin B6) phosphatase.