<prompt> Answer this question truthfullyWhat is the CATCH 22 mnemonic used to remember in relation to a chromosome 22q11 microdeletion?  <response>: <reason> The CATCH 22 mnemonic is used to remember the features associated with a chromosome 22q11 microdeletion, which includes Cleft palate, Abnormal facies, Thymic aplasia, Cardiac abnormalities truncus arteriosus, tetralogy of Fallot, Hypocalcemia lack of parathyroids, and that the 22nd chromosome is affected. 