T helper cells are an established part of adaptive immunity, with several classes like Th1, Th2, and Th17 cells being well-studied. Recently, innate counterparts to these lymphoid cells have come into focus. Termed Innate Lymphoid Cells (ILCs), these cells develop from ID2+ precursor cells and also seem to promote functions associated with T helper cells, but do not share their surface markers (e.g. T cell receptors). And while each group originally held several different names, the nomenclature has been adjusted so that most cells fall into the ILC1, ILC2, or ILC3 class.