FIGURE 5.

Fold change of the Ca²⁺ change after quercitrin treatment. Each line represents the change in the Ca²⁺ fluorescence signal in more than 20 representative single cells in each group during the time course. The common pTAS2R20 is mostly found in pandas outside of the Qinling Mountains; The pTAS2R20‐AH variant carries the mutant site Q296H, and the pTAS2R20‐VQ variant carries the mutant site A52V. These two variants are laboratory‐produced types; The pTAS2R20‐VH variant carries two mutant sites at A52V and Q296H, which are mostly found in Qinling pandas; pcDNA is the vector control; and mG15 is the signaling molecule control