<n0:ComplexDefinition xmlns:n0="http://ncicb.nci.nih.gov/xml/owl/EVS/ComplexProperties.xsd#"><n0:def-definition>T-Cell Activation involves stimulation of T lymphocytes by receptor interaction with mitogens or cell surface-displayed antigens resulting in biosynthesis of lymphokines, cell proliferation, cell differentiation, and maturation to support immune activity.</n0:def-definition><n0:def-source>NCI</n0:def-source></n0:ComplexDefinition>