Heat shock protein 20 promotes sirtuin 1-dependent cell proliferation in induced pluripotent stem cells

Figure 2 Heat shock protein 20 induced proliferation in induced pluripotent stem cells. A: Cell counting of induced pluripotent stem cells (iPSCs) for 6 consecutive days. B: Methyl tetrazolium (MTT) assay showing the growth and metabolic activity of iPSCs; C: Proliferation was assessed by proliferative marker Ki67 in cultured iPSCs; D: Real-time polymerase chain reaction showing the expression of Ki67. Data are expressed as the mean ± SD and were analyzed by the Student’s t-test, ^aP < 0.05, ^bP < 0.01, and ^cP < 0.001. HSP: Heat shock protein.