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Effect of VIP and [L22]-VIP on tracer binding to membranes from CHO cells expressing the VPAC1, VPAC2 and VPAC2-VPAC1 chimaeric receptors C1, C4, C7 and C8. The values were the means of at least three experiments made in duplicate. The data are expressed as per cent of specific tracer binding in the absence of added ligand.
