They’re not viruses, not bacteria, and they don’t look like anything we’ve seen before. They call them obelisks — flattened, ...

An international team of seven scientists, including two Spaniards and Nobel Prize winner Andrew Fire, has discovered new biological entities called "Obelisks" in the bacteria that inhabit the ...

Obelisks defy categorization—lacking the protein shells of viruses yet resembling viroids, these RNA loops represent a distinct and enigmatic form of life. Obelisks could represent ancient ...