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Simulation of MET-CLN2 GAL-CLB2 (no transcriptional control of Cln2 or Clb2 synthesis). In the absence of both methionine and galactose, cells are smaller than wild type, because Cln2 is synthesized constitutively. When galactose is added (arrow), cells get smaller still, eventually dividing at ∼30% of wild-type size. Such small cells may be inviable.
