FIGURE 4. Summary of receptors for umami, sweet, bitter and sour tastes.

From the following article:

The receptors and cells for mammalian taste

Jayaram Chandrashekar, Mark A. Hoon, Nicholas J. P. Ryba & Charles S. Zuker

Nature 444, 288-294(16 November 2006)

doi:10.1038/nature05401

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Schematic representation of taste receptors (and candidate receptors) mediating four of the five basic taste modalities. Although not indicated in the figure, responses to high concentrations of sugars, but not other sweet tastants, are also detected by T1R3 alone15. The grey T2R receptor is designed to illustrate the possibility that T2Rs, much like T1Rs, may function as heteromeric complexes. Similarly, the grey receptor next to PKD2L1 depicts a PKD1-family member as a candidate partner78, 79, 80.

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