Fig. 1From: Genetic diversity and population structure of black cottonwood (Populus deltoides) revealed using simple sequence repeat markersHeat map of the polymorphic SSR loci. The length of amplified fragments at each locus is represented by a colored band and each locus has a unique contrast diagram of fragment size and color. Different colors represent different fragment sizes, with greener colors indicating smaller fragments and redder colors indicating larger fragmentsBack to article page