Interferon (IFN)‐γ, interleukin (IL)‐17A, CD107a and granzyme B expression of total intraepithelial innate lymphoid cells (ILCs) after stimulation in vitro. (a) IFN‐γ, IL‐17A and CD107a‐expressing ILC1s. IFN‐γ: medium = 0.57 ± 0.18 (n = 7), PMA/IO = 14.87 ± 3.80 (n = 7); IL‐17A: medium = 0.18 ± 0.13 (n = 7), PMA/IO = 4.29 ± 1.82 (n = 7); CD107a: medium = 3.39 ± 0.59 (n = 4), PMA/IO = 7.38 ± 0.70 (n = 4) [mean percentage ± standard error of the mean (SEM.)]. (b) Representative dot‐plot of stimulated CD127+ and CD127− ILC1s. Dot‐plots represent one of three independent experiments ***P < 0·0001; *P < 0·05.