Abstract
Variability in gold bead distribution between individual cells was demonstrated in both pituitary melanotrophic cells immunocytochemically reacted for ACTH and in neurohypophysial terminals reacted for oxytocin-neurophysin. Gold beads were confined to the secretory granules compartment of both tissues. Density of gold beads in melanotrophic cells reacted for ACTH varied from 100-480 gold beads/microns 2. A much narrower range of gold beads distribution (460-900 gold beads/microns 2) was observed in axons of the neurohypophysis reacted with anti-oxytocin-neurophysin. These results indicate that the labeling density varies from cell to cell (as well as axon terminals) within morphologically homogeneous populations. Thus, it may reflect certain physiological differences between cells. A suggestion is being made that mean gold bead density coefficient of variation should be calculated by comparison between individual cells.
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