negative regulation of odontogenesis (sensu Vertebrata)

Any process that stops, prevents or reduces the rate, frequency or extent of the formation and development of teeth, the hard, bony appendages which are borne on the jaws, or on other bones in the walls of the mouth or pharynx, as in, but not restricted to, the vertebrates (Vertebrata, ncbi_taxonomy_id:7742).

negative regulation of nucleotide metabolism

Any process that stops, prevents or reduces the rate, frequency or extent of the chemical reactions involving nucleotides.

Catalysis of the reaction: UDP-N-acetyl-D-glucosamine = UDP-N-acetyl-D-mannosamine.

positive regulation of nucleotide metabolism

Any process that activates or increases the rate, frequency or extent of the chemical reactions involving nucleotides.

A tissue-specific, membrane bounded cytoplasmic organelle within which melanin pigments are synthesized and stored. Melanosomes are synthesized in melanocyte cells.

The process by which the anatomical structures of the ear are generated and organized. Morphogenesis pertains to the creation of form. The ear is the sense organ in vertebrates that is specialized for the detection of sound, and the maintenance of balance. Includes the outer ear and middle ear, which collect and transmit sound waves; and the inner ear, which contains the organs of balance and (except in fish) hearing. Also includes the pinna, the visible part of the outer ear, present in some mammals.

The process by which the anatomical structures of the inner ear are generated and organized. Morphogenesis pertains to the creation of form. The inner ear is the structure in vertebrates that contains the organs of balance and hearing. It consists of soft hollow sensory structures (the membranous labyrinth) containing fluid (endolymph) surrounded by fluid (perilymph) and encased in a bony cavity (the bony labyrinth). It consists of two chambers, the sacculus and utriculus, from which arise the cochlea and semicircular canals respectively.

The process by which the anatomical structures of middle ear are generated and organized. Morphogenesis pertains to the creation of form. The middle ear is the air-filled cavity within the skull of vertebrates that lies between the outer ear and the inner ear. It is linked to the pharynx (and therefore to outside air) via the Eustachian tube and in mammals contains the three ear ossicles, which transmit auditory vibrations from the outer ear (via the tympanum) to the inner ear (via the oval window).