Molecular function

Catalysis of the reactions: protein serine + H2O = protein serine + phosphate; protein threonine phosphate + H2O = protein threonine + phosphate; and protein tyrosine phosphate + H2O = protein tyrosine + phosphate.

Note that this term applies only to free amino acids. Consider 'protein serine/threonine phosphatase activity' or 'protein tyrosine/serine/threonine phosphatase activity' if you want to annotate a protein phosphatase.