1 Beagle bitches were infused with potassium cyanide solution after protection with p-aminopropiophenone (PAPP).
2 Methaemoglobin levels fell very rapidly after the start of the infusion.
3 Whole blood and plasma cyanide estimations revealed that most of the cyanide was sequestered inside the red cells.
4 Animals survived a supralethal dose of cyanide when protected with PAPP.
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