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—Long kmers have a lower GC content. (A) Bimodal distribution of kmer unit length. (B) Bimodal distribution of kmer GC content. (C) Short kmers (<10 bp, blue) occupy the full range of GC contents, but long kmers (≥10 bp, pink) all have low GC content. Long kmers might have originated from the AT-rich chloroplast genome.
