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- _4 value "The L-type Ca21 channel is activated by the b-adrenoceptor in the cells isolated from tracheal (Welling et al., 1992a, b), rabbit ear artery (Benham and Tsien, 1988), guinea pig taenia coli (Muraki et al., 1993), rat aorta (Neveu et al., 1994) and rabbit portal vein (Xiong et al., 1994). Although opening of the L-type Ca21 channels increase [Ca21]i, at least in a part of the smooth muscle cell, stimulation of the b-adrenoceptors induce relaxation but not contraction. This discrepancy may be explained by the increase in cyclic AMP and also by the presence of a noncontractile Ca21 compartment in the cell (see sections III.B. and IV.A.2.)." provenance.
- _4 wasQuotedFrom 9228665 provenance.