Tlymphocytesexecuteandcontrolimmunologicalreactionswitharepertoireofcytokines,cytotoxicsubstances,andothermediators.ThequantitativeandqualitativeanalysisofCD4
+TcellsandCD8
+Tcellsspecificallyrecognizingandreactingtowardsadefinedantigenprovideimportantinformationtounderstandtheirfunctioninvariousimmunologicalsituations.Antigen-specificTcellscanbeidentifiedandcharacterizedbyanalyzingtheireffectorfunction,e.g.,productionofcytokines.