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Attention, chocolate lovers: You may not be able to help yourselves. Swiss and British scientists have linked the widespread love of chocolate to a chemical "signature" that may be programmed into our metabolic systems.
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Malaria, falciparum
Malaria, falciparum: The most dangerous type of malaria. Persons carrying the sickle cell gene have some protection against malaria. Persons with a gene for hemoglobin C (another abnormal hemoglobin like sickle hemoglobin), thalassemia trait or deficiency of the enzyme glucose-6-phosphate dehydrogenase (G6PD) are thought also to have partial protection against malaria.