IGHG3 and diabetic kidney disease: 93, 73, 72, and 83 unique N-glycopeptides and 29, 27, 27, and 29 unique N-glycans in HC, MN, DKD, and IgAN, respectively, a total of 350 intact N-glycopeptides (106 IgG1, 111 IgG2, 67 IgG3, and 66 IgG4)