[1] Univ Georgia, Ctr Tropical & Emerging Global Dis, Athens, GA 30602 USA
[2] Univ Penn, Ctr Bioinformat, Dept Genet, Philadelphia, PA USA
[3] Univ Georgia, Dept Genet, Athens, GA 30602 USA
[4] Univ Penn, Ctr Bioinformat, Dept Biol, Philadelphia, PA USA