Carrier Proteins/physiology; Cytoskeletal Proteins/physiology; Ganglia, Sensory/abnormalities; Glossopharyngeal Nerve/abnormalities; Nerve Tissue Proteins/physiology; Neurons, Afferent/metabolism; Vagus Nerve/abnormalities; Animals; Animals, Newborn; Calcitonin Gene-Related Peptide/metabolism; Carrier Proteins/genetics; Cell Differentiation/genetics; Cell Survival/genetics; Chemoreceptor Cells/abnormalities; Chemoreceptor Cells/metabolism; Chemoreceptor Cells/pathology; Cytoskeletal Proteins/genetics; Down-Regulation/genetics; Dystonin; Ganglia, Sensory/metabolism; Ganglia, Sensory/pathology; Glossopharyngeal Nerve/metabolism; Glossopharyngeal Nerve/pathology; Mice; Mice, Transgenic; Nerve Tissue Proteins/genetics; Neurons, Afferent/pathology; Nodose Ganglion/abnormalities; Nodose Ganglion/metabolism; Nodose Ganglion/pathology; Receptors, Purinergic P2/metabolism; Receptors, Purinergic P2X3; Sensory Receptor Cells/abnormalities; Sensory Receptor Cells/metabolism; Sensory Receptor Cells/pathology; Taste/genetics; Taste Buds/abnormalities; Taste Buds/pathology; Tyrosine 3-Monooxygenase/metabolism; Ubiquitin Thiolesterase/metabolism; Vagus Nerve/metabolism; Vagus Nerve/pathology