PSMB8 and Atrophy: As for the Oxford classification of IgAN (M [Mesangial hypercellularity], E [Endocapillary proliferation], S [Segmental sclerosis], T [Tubular atrophy and interstitial fibrosis], and C [Crescentic] scores), the PSMB8 and PSMB9 levels in the tubulointerstitium were markedly increased in the T1/2 groups than those in the T0 groups, respectively (Supplementary File S7).