IGF1 and allergic contact dermatitis: Together with a parallel study, in which allergic contact dermatitis was suppr-essed through IGF-1-mediated Treg cell activation (Johannesson et al, 2014), our results provide a viable protocol for stimulat-ing human Treg cell proliferation in vitro and in vivo and will also help in the search for appropriate clinical and surrogate markers for Treg cell expansion to aid in successful experimental and clinical design of autoimmune therapies.