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  1. Vaccine Types | HHS.gov

  2. Understanding Six Types of Vaccine Technologies | Pfizer

  3. Recombinant Vaccine - an overview | ScienceDirect Topics

  4. Recombinant vaccine - Latest research and news - Nature

  5. Recombinant Vaccine - an overview | ScienceDirect Topics

  6. Chapter 1: Principles of Vaccination | Pink Book | CDC

  7. Vaccine Glossary | Vaccines & Immunizations | CDC