TY - RPRT TI - Population heterogeneity in mutation rate increases mean fitness and the frequency of higher order mutants AU - Helen Alexander AU - Stephanie I. Mayer AU - Sebastian Bonhoeffer PY - 2016 DO - 10.1101/045377 UR - https://www.biorxiv.org/content/10.1101/045377v1 ID - 10.1101/045377 ER -