ACTA1 and focal segmental glomerulosclerosis: JM glomeruli with α-SMA staining increased in both young FSGS mice (30.25±11.07% vs. 19.17±8.12%, p<0.05 young FSGS vs. young baseline) and aged FSGS mice (43.66±16.74% vs. 20.15±7.52%, p<0.001 aged FSGS vs. aged baseline).