The endogenous fatty acid amide, palmitoylethanolamide, has anti-allodynic and anti-hyperalgesic effects in a murine model of neuropathic pain: involvement of CB1, TRPV1 and PPAR-gamma receptors and neurotrophic factors - Costa, B; Comelli, F; Betton, I; Colleoni, M; Giagnoni, G (Pain, 2008)