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buy Viagra 25mg here where to buy viagra without prescription Gene therapy: This novel therapy would deliver genes that produce products or proteins that may not be functioning properly in the penile tissue of men with ED. Replacement of these proteins may result in improvement in erectile function. Experimental animal models have demonstrated improvement in erectile function with gene therapy. Human studies may also demonstrate success with this therapy. Gene therapy may take a long time for regulatory approval and public acceptance. May only help with marginal penile blood Additional Homeopathic Treatments for Erectile Dysfunction (ED) Most of the localization studies for PDE11 have been for PDE11A mRNA products. The data for protein are less certain as few highly specific antisera have been described. There also is likely to be substantial differences in expression between species. Nevertheless, it is clear that the PDE11A variants demonstrate differential tissue expression. In humans, PDE11A1 mRNA is most prominent in skeletal muscle and prostate (Fawcett et al., 2000; Yuasa et al., 2001a). PDE11A3 mRNA is found specifically in testis and PDE11A4 mRNA is highly expressed in prostate (Yuasa et al., 2000). PDE11A protein localization studies have been somewhat contradictory in their findings, probably because of differences in the specificity of the antibodies used. PDE11A1 protein was originally detected in prostate and skeletal muscle (Fawcett et al., 2000), although a later study did not detect PDE11A1 protein in any tissues (Loughney et al., 2005). In fact, only PDE11A4 protein has been verified and is found in prostate, pituitary, heart, and liver. Another study suggested that PDE11A is widely expressed, and immunohistochemistry using an antibody reported to recognize all PDE11A variants localized it to the epithelial, endothelial, and smooth muscle cells of many tissues, but at highest levels in the prostate, testis, kidney, adrenal gland, colon, and skin (D'Andrea et al., 2005). However, a separate study did not find any PDE11 protein expression in human testis (Loughney et al., 2005). As with many PDEs, it is still not clear if the same tissue, cellular, and subcellular localization is found among species. Future work will hopefully rectify the discrepancies regarding the tissue expression of PDE11A.

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