Expression and Trans-Specific Polymorphism of Self-Incompatibility RNases in Coffea (Rubiaceae) Nowak, Michael D. ; Davis, Aaron P. ; Anthony, François ; Yoder, Anne D. Abstract Publication: PLoS ONE Pub Date: June 2011 DOI: 10.1371/journal.pone.0021019 Bibcode: 2011PLoSO...621019N