IL1B and rheumatoid arthritis: Among those three exogenous acylcarnitines, acetylcarnitine and decanoylcarnitine were found enriched in RA FLS, and their levels increased in TNF or IL-1β stimulated NI FLS (Fig. 2, Fig. 3B), and stearoylcarnitine tended to be enriched in RA FLS (Mann-Whitney p = 0.11, fold change 1.56 compared to NI FLS) and to be upregulated by IL-1β stimulation in NI FLS (Wilcoxon test p = 0.08).