Fig. 1From: Genome-wide analysis of SET-domain group histone methyltransferases in apple reveals their role in development and stress responsesChromosomal localization of SDGs in the apple genome. The MdSDGs found on duplicated chromosomal segments are connected by lines. The blue lines represent segmentally duplicated gene pairs, and red lines represent tandem duplicated gene pairs in the apple genome. The numbers of MdSDGs assigned to each chromosome are shown in the histogramBack to article page