text: Adenophostin A is a potent inositol trisphosphate (IP) receptor agonist, but is much more potent than IP.
  IPR is a ligand-gated intracellular Ca release channel that plays a central role in modulating cytoplasmic free Ca concentration (Cai).  Adenophostin A is structurally different from IP but could elicit distinct calcium signals in cells.