by making these measurements in parallel with electron-microscopic studies of the different cell elements of the chick vestibular sensory periphery , we found that the values of gad activity were nearly the same from the earliest stage studied , i.e. , the 13th day of ontogeny to day 18 of embryonic development , paralleling the morphologically mature appearance of the hair cells and their afferent synapses .
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the
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synapses