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In longitudinal smooth muscle from guinea-pig intestine prelabelled with [3H]inositol, carbachol produced a 3-fold increase in [3H]inositol 1,4,5-trisphosphate within 2 s, and there was also a simultaneous increase in [3H]inositol 1,4-bisphosphate. 3H-labelling of inositol 1,3,4,5-tetrakisphosphate was not significantly increased until 60 s after carbachol stimulation, and the accumulation of [3H]inositol 1,3,4-trisphosphate was relatively small.
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SALMON et al. (1988) studied this question.
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