Abstract
RNA prepared from the brains of chick embryos at 12 days of incubation contained a 12-kb transcript that hybridized with a cDNA probe for the aggregating proteoglycan versican. No transcripts were detected in the brains of newborn rats while, at 3 days of postnatal development, three sizes of transcripts were present. None were detected in the 6-day old brain and, at later stages, the smallest transcript predominated.
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