To test anti-FMNL1 specificity for MN, small subgroups of patients affected by other hystologic and genetic forms of glomerulonephritis were tested (23 with idiopathic focal segmental glomerulosclerosis, 6 with genetic FSGS, 12 with IgA glomerulonephritis) (Table 2). Here, FMNL1 is linked to IgA glomerulonephritis.