Scientists have recently discovered the receptor that tells us mammals whether the food or whatever substance in our mouth is, is sour or not.
The tastes in mammals are classified as sweet,salty, bitter, sour and umami (the taste of monosodium glutamate or MSG). However, we have not been able to identify the taste recepetors for sour and salty tastes until now. Research by Charles Zuker of the Howard Hughes Medical Institute in San Diego have identified the protein PKD2L1 as a primary candidate.
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