Correction to: Nature Communications https://doi.org/10.1038/ncomms12879, published online 15 September 2016.

The Supplementary Information associated with this Article contains an error in Supplementary Fig. 6, in which the data in panel a (‘fresh sample’) are inadvertently copied to panels b (‘stored in air’) and c (‘stored in the physiological solution’). The correct version of Supplementary Fig. 6 can be found as Supplementary Information associated with this Correction. The error has not been corrected in the Supplementary Information associated with the Article.