TY - RPRT TI - Collective motion conceals fitness differences in crowded cellular populations AU - Kayser, J. AU - Schreck, C. AU - Gralka, M. AU - Fusco, D. AU - Hallatschek, O. PY - 2018 DO - 10.1101/267286 UR - https://www.biorxiv.org/content/10.1101/267286v1 ID - 10.1101/267286 ER -