two populations of small granulated cells could be distinguished with this technique : one group is formed by cells whose secretory granules with a mean diameter of 141 nm show specific immunoperoxidase staining with anti-pp serum , while the other group consists of cells whose secretory granules measuring 118 nm in diameter show no immunoreactivity to anti-pp serum .
C0007634
cells
C0886515
secretory granules