CD79A and focal segmental glomerulosclerosis: Kidney biopsies may show various light microscopic abnormalities including normal appearances, focal segmental glomerulosclerosis, tubulointerstitial atrophy, and even IgA deposits mimicking IgA nephropathy; however, electron microscopic analysis typically reveals abnormalities, splitting, or thickening of the glomerular basement membrane (GBM) [2].