Abstract
Lesions were made in the spinal cord of cats by means of local injections of 6-aminonicotinamide. The concentration needed to induce primary demyelination also caused extensive axonal death. In the early stages following injection there was evidence of astrocyte and oligodendrocyte destruction and with longer survival times most of the surviving demyelinated axons were remyelinated by Schwann cells. This experimental system indicates that Schwann cell remyelination of central axons follows astrocyte destruction, but it was not considered a suitable model system for the study of cellular relationships in remyelination because of the extensive concomitant axonal damage.
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