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Three-dimensional reconstructions of the cerebral cortex of a rat, viewed from behind. Colored symbols indicate retrovirally labeled neurons that form five clones. The three orange cells and the three green cells represent two widely dispersed neuronal clones, both extending over large cortical distances. See page 434. [Photograph by C. Walsh]


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Science. ISSN 0036-8075 (print), 1095-9203 (online)