Fig. 4From: Non-destructive, spectrophotometric analysis of the thickness of the cell-multilayered periosteal sheetPhotomicrographic observations of cell layers formed by cell outgrowths of nearby pieces of a collagen (col) sponge. a, b Phase-contrast microscopic observations. c H&E staining of sagittal sections. The region of interest for the determination of absorbance is indicated by parentheses and blue lettersBack to article page