Correction to: Cell Research https://doi.org/10.1038/cr.2012.174, published online 18 December 2012

With this letter we the authors of article1 published in Cell Research request for correction to the paper.

In the article above referred, it has come to our attention that the representative tube formation images of negative control (NC) was mistakenly used in the Fig. 7G during figure assembly.

On behalf of all authors, I am writing this letter to request for correction of incorrect image in Fig. 7G of the original article. Please find the corrected Figure included in the attachment. Of note, this correction do not affect the description, interpretation, and conclusions of the manuscript. Meanwhile, no change to the original figure legends are necessary.

We are sincerely apologize for any potential confusion caused by these unintentional errors during figure assembly.