FIG. 4.

Sample concentration depends on the duration of TMPA injection. In these experiments injection duration was varied from 15 min to 90 min, with sampling taking place 2 h after the injection ended. Bars indicate standard deviation. Concentrations were normalized with respect to the measured concentration of the injected solution in each experiment. For 15 and 30 min injections, lower concentrations were measured than with 60 and 90 min injections, suggesting the perilymph and adjacent tissues was not fully loaded with the briefer injections.