Prolonged osmification of stomach epithelium.

Osmium impregnation was used upon the mice stomach epithelium to show possible differences in staining during differentiation. In the cells of the stratified gastric epithelium of 14-day-old mice embryos Os black was completely lacking in the Golgi complex. In some but not all cells the staining appears in the perinuclear space and in the endoplasmic reticulum. In the mucoid cells 1 and 8 days after the birth the osmiophility is not uniformly distributed throughout the endomembrane segments, except the cis face of the Golgi complex which is heavily stained. Our results indicate on the variability of the reduction capacity of particular endomembrane segments during differentiation and among the cells at the definite developmental stage.