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130729-N-DR144-446- Professor of Biology William K. Hayes extracts venom from a Mohave Rattlesnake at Loma Linda University's Center for Biodiversity and Conservation. Hayes and his graduate students are studying venom variability in several species of rattlesnake native to the western United States. Their research suggests the Southern Pacific Rattlesnake may have the widest variability of venom of any rattlesnake and that in parts of its range, its venom may rival the more well-known Mohave Rattlesnake in toxicity.