Recent rapid progress in identifying genes involved in deafness has suggest
ed that a wide range of different types of gene products can result in hear
ing impairment, which, given the complexity of the auditory system, is not
surprising. However, what has given some surprises are the unexpected expre
ssion patterns within the ear of some of these genes, which suggests that c
ochlear physiologists need to look again at some of the cell types involved
.