RADICAL ORGANISMS IN UNREACHABLE NICHES. “Examples of such lineages include the green plants (acquiring chloroplast by endosymbiosis, methanotrophs (gaining the ability to synthesize critical cofactors by acquiring genes from methanogenic archaea, cyanobacteria (gaining a second photosystem allowing oxygenic photosynthesis, and bacteria exploiting halorhodopsin homologues as light-driven proton pumps.”
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