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The effect of TP receptor selective antagonists on the pEC50 value of U46619 in human umbilical artery. Values were obtained from the data shown in Figure 3. The lines show the best fit of the data to equation 2, from which the pKb values given in the text were determined. (a) GR32191, n=4–5; (b) SQ29548, n=6–9; (c) SQ30741, n=4–6; (d) ICI192605, n=4–6.
