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Mast cell

This electron micrograph shows a mast cell in loose connective tissue. The centrally located nucleus is surrounded by numerous secretory granules that contain histamine, heparin and other chemical mediators of the immune response including enzyme proteases.  Bundles of collagen fibrils are also visible. 8,000x

Nucleus <p>This electron micrograph shows a mast cell in loose connective tissue. The centrally located nucleus is surrounded by numerous secretory granules that contain histamine, heparin and other chemical mediators of the immune response including enzyme proteases.  Bundles of collagen fibrils are also visible. 8,000x</p>

Nucleus

This electron micrograph shows a mast cell in loose connective tissue. The centrally located nucleus is surrounded by numerous secretory granules that contain histamine, heparin and other chemical mediators of the immune response including enzyme proteases.  Bundles of collagen fibrils are also visible. 8,000x

Secretory granules <p>This electron micrograph shows a mast cell in loose connective tissue. The centrally located nucleus is surrounded by numerous secretory granules that contain histamine, heparin and other chemical mediators of the immune response including enzyme proteases.  Bundles of collagen fibrils are also visible. 8,000x</p>

Secretory granules

This electron micrograph shows a mast cell in loose connective tissue. The centrally located nucleus is surrounded by numerous secretory granules that contain histamine, heparin and other chemical mediators of the immune response including enzyme proteases.  Bundles of collagen fibrils are also visible. 8,000x

Collagen fibrils <p>This electron micrograph shows a mast cell in loose connective tissue. The centrally located nucleus is surrounded by numerous secretory granules that contain histamine, heparin and other chemical mediators of the immune response including enzyme proteases.  Bundles of collagen fibrils are also visible. 8,000x</p>

Collagen fibrils

This electron micrograph shows a mast cell in loose connective tissue. The centrally located nucleus is surrounded by numerous secretory granules that contain histamine, heparin and other chemical mediators of the immune response including enzyme proteases.  Bundles of collagen fibrils are also visible. 8,000x

Ground substance <p>This electron micrograph shows a mast cell in loose connective tissue. The centrally located nucleus is surrounded by numerous secretory granules that contain histamine, heparin and other chemical mediators of the immune response including enzyme proteases.  Bundles of collagen fibrils are also visible. 8,000x</p>

Ground substance

This electron micrograph shows a mast cell in loose connective tissue. The centrally located nucleus is surrounded by numerous secretory granules that contain histamine, heparin and other chemical mediators of the immune response including enzyme proteases.  Bundles of collagen fibrils are also visible. 8,000x