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Concentration-response curves of dopamine, U-101958 and L-745,870 for inhibition of forskolin-stimulated cyclic AMP accumulation in (a) untreated CHO/D4 cells and CHO/D4 cells treated with 5 mM sodium butyrate for (b) 6 h, (c) 18 h and (d) 48 h. Data are means and vertical lines show s.e.mean from the number (n) of experiments indicated in Table 1.
