I'm theClinicalDirectorofInpatientOncologyattheMassachusettsGeneralHospital, and I directtheSevereImmunotherapyComplicationsServiceandProgramattheMassachusettsGeneralHospitalCancerCenter.
Manytimes a day, anantigen, thesmallblueroundcircleatthetop, ispresentedonanantigen-presentingcellbywayofanMHCmolecule, a majorhistocompatibilitycomplexmolecule.