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Nature 434, 763-767 (7 April 2005) | doi:10.1038/nature03415;

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Sodium channel mutation leading to saxitoxin resistance in clams increases risk of PSP

Bivalve molluscs, the primary vectors of paralytic shellfish poisoning (PSP) in humans, show marked inter-species variation in their capacity to accumulate PSP toxins (PSTs) which has a neural basis. PSTs cause human fatalities by blocking sodium conductance in nerve fibres.

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