Clone OTI4G5 has been reported to be a mouse monoclonal antibody specific to the human gene, PISD, or Phosphatidylserine decarboxylase. Other suppliers describe clone OTI4G5 to be a mouse monoclonal antibody against human MDM4, or MDM4 regulator of p53. An indicated application for antibody clone OTI4G5 is Western blot.