Erratum to: Cell Tissue Res

DOI 10.1007/s00441-016-2495-6

The original version of this article inadvertently contained a mistake.

We wish to bring to your attention an inadvertent omission in Figure 1d in the above manuscript that was not depicted during proofreading. In the image of Figure 1d the annotations mg and bm lack the indicating lines pointing to their specific locations, accidentally lost during resubmission. Please find the revised Figure 1d below.

figure a