<p>This group of conserved proteins from plants and some bacteria contain one copy of the calcineurin-likephosphoesterase domain and possess motifs characteristic of a variety ofenzymatically active phosphoesterases [<cite idref="PUB00014394"/>], including acid and alkaline phosphatases,phosphoprotein phosphatases, 5'-nucleotidase, bis(5'-nucleosyl)-tetraphosphatase (symmetrical), sphingomyelinphosphodiesterase, 2',3'-cylic-nucleotide 2'-phosphodiesterase, and 3',5'-nucleotide phosphodiesterase CpdA.</p>