Perhaps was thinking of https://www.insideprecisionmedicine.com/news-and-features/extensive-dna-breaking-needed-to-make-memories/ https://www.insideprecisionmed

Perhaps was thinking of https://www.insideprecisionmedicine.com/news-and-features/extensive-dna-breaking-needed-to-make-memories/ https://www.insideprecisionmedicine.com/news-and-features/ex... ? Although AFAIK this deliberate DNA breakage doesn't involve actual modification to the DNA...