Beta-Cell-Mediated Signaling Predominates Over Direct Alpha-Cell Signaling in the Regulation of Glucagon Secretion in Humans

This is an uncopyedited electronic version of an article accepted for publication in Diabetes Care. The American Diabetes Association, publisher of Diabetes Care, is not responsible for any errors or omissions in this version of the manuscript or any version derived from it by third parties. The definitive publisherauthenticated version will be available in a future issue of Diabetes Care in print and online at http://care.diabetesjournals.org. Diabetes Care Publish Ahead of Print, published online September 3, 2009

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