Other than the 3 bird species mentioned, the remaining bird species carry at least one functional Tas2r, indicating that the bitter taste function is retained in 45 birds.
By age 75, the weight of the brain is reduced from its maximum at maturity by about one-tenth, the flow of blood through the brain by almost one-fifth, and the number of functional taste buds by about two-thirds.
Therefore, current efforts are mainly focused on the preparation of functional taste cells and receptors and their coupling with transducers.
These findings corroborate previous behavioural studies suggesting that taste perception is functional in bottlenose dolphins, at least in young individuals.
Together, these data demonstrate that the Drosophila wing chemosensory sensilla are a functional taste organ and that they may have a role in the exploration of ecological niches.
Currently, one of the main challenges of this technology is the preparation of functional taste cells and receptors to satisfy the need of building sensing components for chemical sensors.
Taste cells expressing functional AS channels have also been shown to possess large voltage-gated sodium currents that underlie the generation of action potentials [55].
Although our physiological experiments were conducted in vallate, not fungiform, taste buds, our functional data and the peripheral location of YFP-expressing cells in fungiform taste buds (Figs. 2B C) are consistent with the results of Yoshii and colleagues [33].
These findings suggested that calorie-rich nutrients could directly influence brain reward circuits that control food intake independently of palatability or functional taste transduction [ 128].
