Sour comes after a lemon has gone

The research group led by Professor Makoto Tominaga and Research Assistant Professor Hitoshi Inada (National Institute for Physiological Sciences, Okazaki, Japan) found that a sour taste receptor, PKD1L3-PKD2L1 channel complex, could be activated by acid stimulus but opened gate only after the removal of acid stimulus. They call this new type of response as "off-response" of sour taste receptor. They reports their finding in an international journal, EMBO reports, on June 6, 2008.

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