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Selection of pre-existing polymorphisms in six salt stress-evolved ES populations (a–c) or six non-stress-evolved EC populations (d). Chromatograms of the sequences of the nucleotide(s) with mutations and the adjacent nucleotides are shown. *: polymorphisms; Δ: ES-type mutation as seen in ES9; ○: EC-type mutation as seen in EC3; #: no mutation.
