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The number and distribution of SSRs of four Quercus section Cyclobalanopsis chloroplast genomes: (a) The number of SSRs with six repeat types (mononucleotides: mono-, dinucleotides: di-, trinucleotides: tri-, tetranucleotides: tetra-, pentanucleotides: penta-, and hexanucleotides: hexa-) and (b) The number of SSRs in different regions of chloroplast genomes.
