Text and Data Mining valid from 2014-12-01
Received: 3 April 2014
Accepted: 22 October 2014
First Online: 4 December 2014
: C.L., Q.N., B.N. and S.R. are all currently employed by Affymetrix, Inc. However, this does not alter the authors' adherence to all the Nature Communications policies on sharing data and materials. The remaining authors declare no competing financial interests.