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The drawing was made by Dana Burns, and can also be found in Scientific American, 1985, 253(4), pages 86-90, in the article The molecules of the cell membrane by M.S. Bretscher.
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{{Information |Description= |Source=[http://www.ncnr.nist.gov/programs/reflect/rp/biology/cell_membrane.html NIST]: ''These World Wide Web pages are provided as a public service by the National Institute of Standards and Technology (NIST). With the except