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During the preparation of panel J, the bands of β-actin were cut out and attached in the middle to remove non-specific bands. The bands of all samples were located on the same membrane. Unfortunately this panel was included in our article by mistake.
We are now providing a new version of Fig. 2 below which presents in panel J experimental data which were obtained at the same time.
The protein band intensity was re-quantified by densitometry (CS Analyzer) using the correct TRH-DE and β-actin band. Relative protein expression level was evaluated on the basis of band intensity of TRH-DE/β-actin. Each expression level of normal pulp was defined as 1.0.
We apologize for this error and confirm that the conclusions of the article are not affected.
The online version of the original article can be found under doi:10.1186/s13287-015-0088-z.