The sense of taste is perceived by tongue though the taste buds, the receptors of taste. Taste buds are distributed in the oral cavity including in the mucosa of the epiglottis, palate, pharynx and inner surface of the cheeks. Taste buds are present at the sides and base of the tongue.
The perception of bitter taste occurs at the back of the tongue, which respond to the alkaloids such as caffeine. Bitter taste perception requires the “TAS2R38 allele and the number of taste buds.
Thus, the blanks can be filled with TAS2R 38 allele and the number of taste buds.