Large-scale dissection suggests that ultraconserved elements are dispensable for mouse embryonic stem cell survival and fitness

Withdrawal statement The authors have withdrawn their manuscript from bioRxiv regretfully. During additional experiments for the revision we noticed inconsistencies in some results, which may affect the main conclusion of the manuscript. In particular, we noticed that using different primer pairs, some clones that were classified as homozygous knockouts, are actually not knockouts. These were unexpected findings, but might reflect the recently described larger rearrangements observed using CRISPR technology1,2,3,4. Follow up experiments are ongoing, but we would like to withdraw the manuscript at this point in time to avoid misunderstandings. Therefore, the manuscript should currently not be cited. Any questions regarding the manuscript should be addressed to the corresponding author.