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Histological sections of (a) collagen-spheroids-dentin, (b) collagen monolayer fibroblast-dentin, (c) PGA-spheroid-dentin, and (d) PGA-monolayer fibroblast-dentin cultures after 20 days. Hematoxylin and eosin, original magnification ×40 (scale bar = 50 μm).
