A, top left, Representative immunoblot of human coronary microvessels. Lanes 1 to 4 loaded with 40 μg protein were developed for BK-α, BK-β1, IKCa-α, and SK3Ca-α polypeptides B, top right, Densitometric evaluation of immunoblot band intensity shows unaltered levels of KCa polypeptides after CP Rep (n=5/group). C, bottom, Semiquantitative reverse transcriptase-polymerase chain reaction showing steady-state levels of mRNA for IKCa and β-actin control in human atrial tissue pre- and CP and Rep.