*️⃣Abst#1800 observed that a changing pattern of purine, lipid, & amino acid metabolites occurred during transition from PsO to PsA. *️⃣Compared to pts w/ Pso that didn't progress to PsA, those that progressed had elevated levels of guanine! Potential biomarkers? #ACR21 @RheumNow https://t.co/iQh1ZapDMB