Subsampled open-reference clustering creates consistent, comprehensive OTU definitions and scales to billions of sequences

Jai Ram Rideout, Yan He, Jose A. Navas-Molina, William A. Walters, Luke K. Ursell, Sean M. Gibbons, John Chase, Daniel McDonald, Antonio Gonzalez, Adam Robbins-Pianka, Jose C. Clemente, Jack A. Gilbert, Susan M. Huse, Hong Wei Zhou, Rob Knight, J. Gregory Caporaso