Human IL-25- and IL-33-responsive type 2 innate lymphoid cells are defined by expression of CRTH2 and CD161 - Mjösberg, J M; Trifari, S; Crellin, N K; Peters, C P; van Drunen, C M; Piet, B; Fokkens, W J; Cupedo, T; Spits, H (Nat Immunol, 2011)