ILC1 populations join the border patrol.
Maloy KJ., Uhlig HH.
It has been unclear whether an innate lymphoid cell (ILC) counterpart to the T helper 1 cell type exists. New studies, including Fuchs et al. (2013) in this issue of Immunity, identify T-bet(+)IFN-γ(+) ILC1 that accumulate in the inflamed intestine of IBD patients.