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Treatment of the human fibrosarcoma cell line HT-1080 with glucocorticoids results in the induction of fibronectin (FN) protein and mRNA synthesis. We tested the contribution of transcriptional and post-transcriptional mechanisms in the regulation of FN by the synthetic glucocorticoid dexamethasone (DEX). Using nuclear run-on experiments, we found that the DEX-dependent induction of FN occurs primarily...