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Carotenoid pigmentation in Great Salt Lake (Utah, United States) halophilic archaea (a) embedded in a shoreline salt crust, (b) growing in colonies on salt agar, and (c) coloring the north arm water pink. (d) A Great Salt Lake Halorubrum species was grown in the absence (top) and presence (bottom) of full spectrum light, demonstrating the impact of light on carotenogenesis (Baxter et al., 2007).
