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Figure 5 Effects of rapid atrial pacing on messenger ribonucleic acid (mRNA) levels of Kv4.3, Kv4.2, Kv1.4, and KChIP2. (A) Representative agarose gels for semiquantitative reverse transcription-polymerase chain reaction of the rabbit potassium channel genes Kv4.3, Kv4.2, Kv1.4, and KChIP2, with G3PDH as standard. (B) Histogram of the densitometric analysis. *p < 0.05 and **p < 0.01 vs. P0 (One-way analysis of variance. Comparisons between multiple groups were performed with a Bonferroni corrected t test).