The article should have cited the following paper:
I. D. Duncan, J. P. Hammang, K. F. Jackson, P. M. Wood, R. P. Bunge, L. Langford, Transplantation of oligodendrocytes and Schwann cells into the spinal cord of the myelin-deficient rat. J. Neurocytol. 17, 351–360 (1988).
The corrected online version of the article is at http://stm.sciencemag.org/content/4/155/155ra137.full, and the corrected PDF version of the article is at http://stm.sciencemag.org/content/4/155/155ra137.full.pdf.
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