Antioxidant systems and lymphocyte proliferation in the horse, sheep and dog Elisabetta Chiaradia, Alberto Gaiti, Lucia Scaringi, Paola Cornacchione, Pierfrancesco Marconi and Luca Avellini Vet. Res., 33 6 (2002) 661-668 DOI: 10.1051/vetres:2002047