what's the frequency of the letter "c" in:
the aim of the present study was to investigate the binding affinities and dissociation potencies of several 5-ht 2 antagonists in m 2 muscarinic receptor of rat heart membranes using [ 3 h]qnb as a radioligand. the 5-ht 2 antagonists used in this study were sarpogrelate, ketanserin and cyproheptadine. the results showed that sarpogrelate and ketanserin had very weak binding affinities to m 2 muscarinic receptor, whereas cyproheptadine had higher binding affinity to this receptor than the more » ... ptor than the muscarinic receptor antagonist, atropine. all of these three 5-ht 2 antagonists as well as muscarinic receptor antagonists (atropine and pirenzepine) were readily dissociated from m 2 muscarinic receptor in rat heart membranes after washing. therefore, the findings of the present investigation suggest that the dissociation potencies of neither 5-ht 2 antagonists nor muscarinic antagonists used correlate with their binding affinities to m 2 muscarinic receptors in rat heart.

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In that passage, there are twenty-nine occurrences of the letter "c."
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