The surprising discovery of entities smaller than viruses raises profound questions about what life is and how it got started ...

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 ...

Researchers at the University of Liège (Belgium) have uncovered a previously unknown mechanism that regulates the immune response against parasites. During a parasitic infection, specific immune ...