Anthropic says Claude found a previously undescribed enzyme system in bacteriophage DNA. One research brief, a database of 1.9 billion protein clusters, roughly 950 agent sessions running 21 hours & consuming about 210 million tokens. The system is called ART: array-associated reverse transcriptase & has three parts: the enzyme, a partner gene of unknown function, & an array of 3 to 21 evenly spaced DNA repeats. The repeat layout is what drew the CRISPR comparison. In CRISPR, an array like that stores RNA guides, which is what makes the system programmable. Now the caveats, which matter more than the headline. The enzyme itself wasn't actually new, earlier studies had identified it. What's new is the recognition of the array & the partner protein alongside it. Nobody knows what ART does. Lab work confirmed the array is expressed as several short RNAs & that's where the biology currently stops. No demonstrated function, no gene-editing capability, preprint not peer-reviewed. Feng Zhang, one of CRISPR's pioneers, reviewed it & called the finding intriguing & worth further investigation, which is a careful scientist's phrasing, not an endorsement. Other researchers have been less impressed. 🤷‍♂️