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Malaria infection includes symptoms such as headaches, fever, fatigue, and vomiting and can be deadly. Transmitted via a mosquito bite, the parasite Plasmodium enters the bloodstream and infects red blood cells. The parasite then digests hemoglobin--the oxygen-carrying protein in the blood--and converts it into hemozoin, a protein indispensable for parasite survival. While some of the current anti-malarial drugs target this digestion pathway, resistance to these drugs has also been reported. To address this resistance, Leiden University Medical Centre researcher Shahid Khan and colleagues created a mouse parasite lacking critical "Pac-Man" enzymes required to chew up hemoglobin. These mutant parasites are able to survive and multiply inside immature red blood cells called reticulocytes, without making hemozoin. Surprisingly, the mutant parasites cannot be killed by the anti-malarial drug chloroquine, which interferes with hemozoin formation, but yet, remain sensitive to the drug artesunate which targets another pathway of hemoglobin digestion.