The authors asked for the change of the figure 1. They wanted to send the figure that was 200 times bigger under the microscope as described in Figure 1 caption, however, they mistakenly uploaded the wrong picture. Reference: 1. Tao Wang, Si-Dong Yang, Sen Liu, Hui Wang, Huan Liu, Wen Yuan Ding: 17ß-Estradiol Inhibites Tumor Necrosis Factor-alpha Induced Apoptosis of Human Nucleus Pulposus Cells via the PI3K/Akt Pathway. Med Sci Monit, 2016; 22: 4312-4322. DOI: 10.12659/MSM.900310.