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Catfishes possess the most extensive distribution of taste buds found in vertebrates. Taste buds on the external body surface are exclusively innervated by VII, whereas IX, along with the vagus (X), innervate the vast majority of taste buds within the oropharyngeal cavity. Responses to the l-isomers of alanine (Ala), arginine (Arg), and proline (Pro), the three most stimulatory amino acids that bind to independent taste receptors, were obtained from 90 single VII and 64 single IX taste fibers. This study confirmed a previous investigation that the amino acid responsive VII fibers consist of two major groups, the Ala and Arg clusters containing taste fibers having thresholds in the \u03b7M range. In contrast, the present study indicates the amino acid responsive IX taste system is dominated by taste fibers responsive to Pro and to Pro and Arg, respectively, has a reduced percentage of Ala fibers, and is less sensitive than VII. The present electrophysiological results are consistent with previous experiments, indicating that the extraoral taste system is essential for appetitive behavior, whereas oropharyngeal taste buds are critical for consummatory behavior.<\/jats:p>","DOI":"10.1152\/jn.00894.2009","type":"journal-article","created":{"date-parts":[[2010,2,11]],"date-time":"2010-02-11T04:24:33Z","timestamp":1265862273000},"page":"2062-2073","source":"Crossref","is-referenced-by-count":13,"title":["Major Differences in the Proportion of Amino Acid Fiber Types Transmitting Taste Information From Oral and Extraoral Regions in the Channel Catfish"],"prefix":"10.1152","volume":"103","author":[{"given":"Kazuaki","family":"Ogawa","sequence":"first","affiliation":[{"name":"Department of Biological Sciences, Louisiana State University, Baton Rouge, Louisiana"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"John","family":"Caprio","sequence":"additional","affiliation":[{"name":"Department of 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