Platelet monoamine oxidase: studies on the rate of heat inactivation in normal and in paranoid and nonparanoid chronic schizophrenic groups.

The heat inactivation curves for platelet monoamine oxidase (MAO) in chronic schizophrenic and normal subjects were virtually identical. There were also no differences found when schizophrenic patients were subgrouped into paranoid and nonparanoid types. However, the MAO from one of the normal subjects showed a substantially greater thermolability than that of any other control or schizophrenic subject.