The Use of Mercuric Bromphenol Blue as a Stain for Electron Microscopy

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Abstract
Mercuric bromphenol blue, a stain in common use for the iden-tification of protein, was used in a study of the slime mold Physarum polycephalum. Comparison of sections of stained and unstained osmium-fixed material showed dense ovoid bodies in the stained tissue which were barely discernible in the unstained. Whether osmium fixation alters the specificity of this stain, is not known.