For some people, fava beans can be deadly. What is it about this little legume that makes it so?

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Image Sources:
https://commons.wikimedia.org/wiki/File:Broad-beans-after-cooking.jpg
https://commons.wikimedia.org/wiki/File:G6PD_-_3D_structure_-_PDB1qki.png
https://commons.wikimedia.org/wiki/File:Tuinboon_voor_zaad.jpg
https://commons.wikimedia.org/wiki/File:Malaria.jpg

Sources:
https://ghr.nlm.nih.gov/condition/glucose-6-phosphate-dehydrogenase-deficiency
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2749581/
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2398001/pdf/postmedj00048-0016.pdf
https://www.researchgate.net/publication/5672089_Cappellini_MD_Fiorelli_G_Glucose-6-phosphate_dehydrogenase_deficiency_Lancet_371_64-74
http://www.bloodjournal.org/content/92/7/2527