Fig 1: Urine proteins that correlate best with urine creatinine. The aptamer-based screen identified five urine proteins that correlated best with urine creatinine but not differ between subject groups. As described in Figure 1 , the levels of 1129 urine proteins were assayed in 7 active LN, 8 inactive LN, 8 healthy controls using an aptamer-based proteomic screen. Of these, urine BMPRII, Dectin-1, HVEM, RELT, and SPINT2 (A–E) exhibited the highest Pearson R correlation with creatinine but did not differ significantly between the subject groups.