NCR2 and rheumatoid arthritis: Takaki-Kuwahara A et al. revealed that the proportion of ILC1s in SF is negatively correlated with tender (TJC) and swollen (SJC) joint counts, but NKp44+ILC3s is positively correlated with TJC and SJC, suggesting that ILC3s aggravate the inflammation in patients with RA [10].