Fig. 2
From: An evolutionary optimization of a rhodopsin-based phototrophic metabolism in Escherichia coli
Scanning electron microscopic images of the population of chemostat-cultured E. coli cells expressing GR under illumination condition. a Ancestral E. coli expressing GR (×10,000 magnification). b Population of the evolved E. coli expressing GR after 30 days of the chemostat culture (×9000 magnification). c Population of the evolved E. coli expressing GR after 88 days of the chemostat culture (×10,000 magnification)