Figure 2From: Lower expressions of the human bitter taste receptor TAS2R in smokers: reverse transcriptase-polymerase chain reaction analysisRelation between number of expression of TAS2R and age and smoking behaviors. A significant positive correlation was observed between age and bitter taste receptor expression in non-smokers but not in smokers (a). There was no significant association between bitter taste receptor expression and duration of smoking (b), the number of cigarettes smoked daily (c), and the Brinkman index (d).Back to article page