Abstract
Summary
1. Melanin granules were obtained by differential centrifugation from the S-91 and Harding-Passey transplantable mouse melanomas, from the choroid, ciliary body and iris of the beef eye, and from colored human skin. These preparations were characterized with teh electron microscope.
2. the melanin-containing pseudoglobulin from the S-91 melanoma was shown to consist of melanin granules unchanged in shape or size with respect to granules obtained by centrifugation.
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