RBP4 and tuberculosis: By comparing urine samples from 21 active TB, 24 LTBI, and 18 healthy controls via LC–MS/MS, Young et al. identified IGKC, RBP4, PTGDS, AMBP, ORM1, IGCL2, and SECTM1 as potential protein biomarkers for distinguishing TB from LTBI or healthy control samples.