![Early development of ILC2 in the embryonic thymus](https://www2.mrc-lmb.cam.ac.uk/wordpress/wp-content/uploads/Scientific_stories_NI_Ferreira_Fig2-sq-150x150.jpg)
Type 2 ILCs (ILC2s) play an important role in dealing with parasites and are implicated in allergy. Andrew McKenzie’s group has discovered that the transcription factor RORα acts as a checkpoint controlling divergence between T cell and ILC2 development.