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In the treated rabbits, tests showed that pressure inside the penis, a key component of an erection, was normal. Other tests showed that blood flow, response to nitric oxide, drainage of the blood after the erection and presence of sperm in the female vagina were also normal. The tissue engineering worked so well that four of 12 females were impregnated by the repaired rabbits, according to the study. The opinions and assertions contained herein are the private views of the authors and are not to be construed as official or as reflecting the views of the Navy Medical Department or the Naval Service at large. ED is treatable at all ages. buy Viagra 25mg here real viagra online without prescription Figure 1. PDE5 inhibition imparts a measurable immune-mediated antitumor effect. BALB/c or BALB/c Rag-2–/– mice were challenged s.c. with 0.5 x 106 CT26WT (A), C26GM colon carcinoma (B), or TS/A mammary adenocarcinoma (C) cells. (D) C57BL/6 mice were challenged with 0.5 x 106 MCA203 s.c. PDE5 inhibitors were started on day 0. Sildenafil was added to the drinking water or given i.p. daily. Tadalafil was given i.p. daily where indicated in B. Error bar values are shown. "There's the question of how you restore that needed blood supply," Sharlip said. "You may be able to restore the natural spongy tissue of these erection chambers, but in a patient with severe corporal fibrosis you also have to get the blood supply to come back into the new, restored tissue." Without that steady source of oxygen, any implant might meet the same fate as the tissue it had replaced, he said.