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" This is a close-up picture of the evolution of the local maxima and minima of the phytoplankton population as a function of turbulent diffusivity , near the low end of the realistic range 0.1 < κ < 1 . Although much emphasis has been placed on changes in transcriptional regulation , gene expression is regulated at many levels , all of which must ultimately be studied together to obtain a complete picture of the evolution of gene expression .