Magnified 1200X, and using a trichrome stain, this 1973 photomicrograph depicted a Hartmannella veriformis protozoan cyst. Note that this cyst is encased in a double-walled membrane, which consists of an inner, 'endocyst', and an outer-walled 'ectocyst'. The endocyst is intimately associated with the plasma membrane, while there is a distinct space between the endo- and outer, ectocyst membrances.
CDC/ Dr. George Healy
June 9, 2012
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