The present application is a continuation-in-part application of U.S. patent application Ser. No. 11/080,257, which was filed Mar. 15, 2005, claiming the benefit of priority of U.S. Provisional Application No. 60/553,641, which was filed Mar. 16, 2004. The entire text of each of the aforementioned applications is specifically incorporated herein by reference.
This invention was made with government support under grant number DK 55823 awarded by National Institutes of Health. The government has certain rights in the invention.
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