Zinc in Entamoeba invadens

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Science  26 May 1972:
Vol. 176, Issue 4037, pp. 929-930
DOI: 10.1126/science.176.4037.929


Atomic absorption spectroscopy, electron microprobe analysis, and dithizone staining of trophozoites and cysts of Entamoeba invadens demonstrate that these cells have a high concentration of zinc (approximately 10-6 microgram per cell or 1 percent of their dry weight). In the cysts of this organism, the zinc is confined to the chromatoid bodies, which previous work has shown to contain crystals of ribosomes. The chemical state and function of this zinc are unknown.