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Ricin - Wikipedia
CDC | Facts About Ricin
Ricin poisoning - Mayo Clinic
CDC | Questions and Answers About Ricin
Ricin | Symptoms, Treatment & Prevention | Britannica
Ricin Poisoning: Causes, Symptoms, Next Steps - Healthline
Ricin Poisoning: Symptoms, Antidote, and Treatment - eMedicineHealth
Ricin explained: Just how deadly is it, how does it kill? - USA TODAY
Ricin Toxicity - StatPearls - NCBI Bookshelf
CDC Ricin | Treatment Overview for Clinicians