in the electron micrographs stained with uranyl acetate and lead citrate , the greatly increased density of the rosette-like structures and large diameter of the proteoglycan structures located in mineral clusters contrasted sharply with the slender strands of more faintly stained proteoglycan that was diffusely distributed throughout most of the extracellular matrix .
C0033692
proteoglycan
C0015350
extracellular matrix