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Genetic variation and structure analysis of 50 cucumber chloroplast genomes. (a) Statistics of nucleotide diversity (Pi) in 50 cucumber chloroplast genomes with parameters of a window length of 1000 bp and a step size of 100 bp. (b) The variations in 50 cucumber chloroplast genomes. The phylogenetic tree (c) and population structure analyses (d) are based on SNP.
