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Article History

Received: 25 February 2016

Accepted: 29 March 2016

First Online: 4 May 2016

Change Date: 17 May 2016

Change Type: Erratum

Change Details: In the version of this Technical Report originally published online, in Fig. 1d (which presents pilot <i>in vitro</i> culture experiments) it erroneously stated that 20% HCS was used in the IVC2 medium; it should have stated that 30% KSR was used. This error arose by a miscommunication between the postdoctoral fellow who contributed to the pilot <i>in vitro</i> culture experiments and prepared the media, and the postdoctoral fellow who performed the experiments. The composition of the media has been verified based on the laboratory notebooks that describe the media preparation. This error has been corrected in the labels and caption of Fig. 1d, in the description of the results in the main text, and in the Methods section, in all versions of the Technical Report.

Competing interests

: The authors declare no competing financial interests.