<P> The cell cycle inhibitor p27kip1 (CDKN1B) has also been found to encourage regrowth of cochlear hair cells in mice following genetic deletion or knock down with siRNA targeting p27 . Research on hair cell regeneration may bring us closer to clinical treatment for human hearing loss caused by hair cell damage or death . </P> <Ul> <Li> <P> The lamina reticularis and subjacent structures . </P> </Li> <Li> <P> Inner ear illustration showing semicircular canal, hair cells, ampulla, cupula, vestibular nerve, & fluid </P> </Li> <Li> <P> Stereocilia of frog inner ear </P> </Li> </Ul> <Li> <P> The lamina reticularis and subjacent structures . </P> </Li> <P> The lamina reticularis and subjacent structures . </P>

The quantity of neurotransmitter that is released by a hair cell