Previous Article Next Article Table of Contents Nature, Vol.584, No.7821, E20-E28, 2020 DOI10.1038/s41586-020-2522-3 Export Citation APP gene copy number changes reflect exogenous contamination Kim JH, Zhao BX, Huang AY, Miller MB, Lodato MA, Walsh CA, Lee EA Please enable JavaScript to view the comments powered by Disqus.