(A): Agarose gel analysis of RT-PCR products encoding SK3 fragments in rats' corpus cavernosum. The Gadph amplification primers were used as controls, 1, 2: Gadph; 3: marker; 4: DM group; 5: NDM group. (B): Densitometry was performed at nonsaturating exposures,and the SK3/Gadph ratios were determined, The data were expressed as mean ± SD (NDM group: n =10, DM group: n = 20). All results are representative of three independent experiments. *P < 0.05; compared with the control group. DM, diabetes mellitus group; NDM, control group.