hUC-MSCs treatment significantly further increased PCNA-positive tubular cells from 6.5±0.3 to 8.3±0.3 (cells/1000 renal tubular cells) at day 3 and from 2.8±0.2 to 3.8±0.3 (cells/1000 renal tubular cells) at day 7 in NOD-SCID mice suffering from AKI by FA. The gene discussed is PCNA; the disease is acute kidney injury.