A General Model of Negative Frequency Dependent Selection Explains Global Patterns of Human ABO Polymorphism Villanea, Fernando A. ; Safi, Kristin N. ; Busch, Jeremiah W. Abstract Publication: PLoS ONE Pub Date: May 2015 DOI: 10.1371/journal.pone.0125003 Bibcode: 2015PLoSO..1025003V