Figure 5From: Effects of TGF-β1 and IGF-1 on proliferation of human nucleus pulposus cells in medium with different serum concentrationsThe morphology of human NP cells under 1%FBS conditions. 1%FBS, 10 μg/L TGF-β1, NP cells were similar to the normal NP cells with regular spindle-shape. (×100).Back to article page