Proteins of urine and detergent-resistant aggregates from patients with proteinuria. Samples are separated in polyacrylamide gel electrophoresis and stained by Coomassie Brilliant Blue. BSA—bovine serum albumin, AL—AL amyloidosis, AA—AA amyloidosis, MN—membranous nephropathy, IgA—immunoglobulin A nephropathy. Spectra Multicolor Broad Range Protein Ladder (no. 26634) (Thermo Fisher Scientific, Waltham, MA, USA) is shown to the left of the gels. Red line indicates the area just above the BSA band (2 µg) that runs at the level of human serum albumin in the samples on the right (lines 1–12). Images was obtained by S.A. Fedotov.