T-helper 1 cell activation
http://purl.obolibrary.org/obo/GO_0035711
The change in morphology and behavior of a T-helper 1 cell resulting from exposure to a mitogen, cytokine, chemokine, cellular ligand, or an antigen for which it is specific. [ http://purl.obolibrary.org/obo/CL_0000545 GOC:BHF ]
Synonyms: Th1 cell activation