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Distribution of twenty-two ClaSWEET genes on watermelon chromosomes. The scale ruler on the left side shows the physical distance (Mb) of the chromosomes. The relative positions of ClaSWEETs are marked on the chromosomes. According to their physical location on the chromosomes, the SWEET genes of watermelon named from ClaSWEET1 to ClaSWEET22 correspond to the genes’ ID. Triangles represent the transcriptional direction of each gene: ▲ backwards transcription, ▼ forward transcription.
