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Cole SP, Bhardwaj G, Gerlach JH, Mackie JE, Grant CE, Almquist KC, Stewart AJ, Kurz EU, Duncan AM, Deeley RG.Cole SP, et al.Science. 1992 Dec 4;258(5088):1650-4. doi: 10.1126/science.1360704.Science. 1992.PMID: 1360704