RNA obelisk, illustration
Illustration of an RNA (ribonucleic acid) obelisk in the human gut. RNA obelisks are virus-like fragments of RNA that have been found replicating in bacteria in the human mouth and gut. They are formed of single-stranded circular RNA and have a rod-like secondary structure. They code for proteins that are of unknown function., by THOM LEACH / SCIENCE PHOTO LIBRARY
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