Nancy A. Melville July 31, 2023 Patients with acute tubulointerstitial nephritis (AIN), a difficult-to-diagnose allergic reaction in the kidneys, show substantial increases in the protein CXCL9 in their urine, suggesting an essential, fast, and easy-to-test biomarker that could replace the more time-consuming kidney biopsy. “Our data show that in patients with suspected AIN the urine biomarker CXCL9 can significantly...