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A very ascetic cell genome.

Jack Rusher@jackrusher.com

“JCVI-Syn3.0 (474 genes) has a genome smaller than that of any autonomously replicating cell found in nature. Surprisingly, it contained 149 genes with unknown biological functions, suggesting the presence of undiscovered functions essential for life.”

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Another ascetic genome is Utricularia Gibba's but that's a plant and its genome is some 160x the bacterium's described in this paper. Nonetheless it is much smaller than close relatives and deprived of so-called junk-DNA, supporting the idea that junk-DNA isn't necessary.