FIGURE 5. Behavioural attraction and aversion are mediated by dedicated taste-receptor cells.

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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Targeted expression of a novel bitter receptor to bitter (T2R-expressing) cells results in dose-dependent aversion to the specific bitter tastant (open blue squares). In marked contrast, directing expression of the same receptor to sweet cells produces animals that are strongly attracted to this bitter tastant (filled red circles). Control animals lacking the receptor (filled grey circles) are indifferent to the tastant.

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