IL1B and disease of the tendon: Similarly, in incubations with cells from tendinopathy patients, IL-1β and MaR1 (10 nM) we found elevated concentrations of the MaR1 metabolite 14-oxo-MaR1 compared to healthy cells incubated with IL-1β and MaR1 (p = 0.01) (Fig. 4B, Supplemental Tables 1 and 2).