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https://pubmed.ncbi.nlm.nih.gov/38113556
The abstract reports on a study using energy-dispersive X-ray fluorescence (EDXRF) to analyze the distribution of K, Ca, As, and Fe in normal and amyloid-containing tissues, finding that amyloidogenic tissues have lower levels of K, Ca, and Fe, and often contain As, which has been difficult to detect in past studies.