Stock culture heterogeneity rather than new mutational variation complicates short-term cell physiology studies of Escherichia coli K-12 MG1655 in continuous cultureNahku, Ranno; Peebo, Karl; Valgepea, Kaspar; Barrick, Jeffrey E.; Adamberg, Kaarel; Vilu, RaivoMicrobiology2011 / p. 2604-2610 https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3352173/