T regulatory cells are markers of disease activity in multiple sclerosis patients

Libera, Dd; Di Mitri, D; Bergami, A; Centonze, D; Gasperini, C; Grasso, Mg; Galgani, S; Martinelli, V; Comi, Giancarlo; Avolio, C; Martino, Gianvito; Borsellino, G; Sallusto, F; Battistini, L; Furlan, R.