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Survival of spiral ganglion (SG) neurons is shown as a function of duration of deafness for cats deafened immediately after birth by administration of daily injections of the ototoxic drug, neomycin sulfate. The data are presented as mean SG cell density (averaged throughout the cochlea) and expressed as percent of normal. SG survival is strongly correlated with duration of deafness, although there is considerable individual variability for a given duration of deafness.
