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  1. Ricin - Wikipedia

  2. Ricinus - Wikipedia

  3. CDC | Facts About Ricin

  4. Ricin poisoning - Mayo Clinic

  5. CDC | Questions and Answers About Ricin

  6. Ricin Poisoning: Causes, Symptoms, Next Steps - Healthline

  7. Castor-oil plant | Description, Uses, & Ricin | Britannica

  8. Ricin: Biotoxin | NIOSH | CDC

  9. CDC Ricin | Background Information for Clinicians

  10. Ricin | Symptoms, Treatment & Prevention | Britannica