g. G. 1. et al. Pervasive genetic hitchhiking and clonal interference in forty evolving yeast populations. Nature 500. 571-574 (2013). 46. Victors. G. D. & Nussenzweig, M. C Germinal centers. Anna. Rev. Iminunot 30. 429-457 (2012). 47. Pavlogiannis. A.. Tkadlec, L. Chatterjee. K. & Nowak. M. A. Strong amplifiers