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CHAPTER 3 - CONNECTIVE TISSUE
Histology Guide
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MICROGRAPH

NAME
EM 014 Mast Cell
TISSUE
Liver Capsule
(rat)
IMAGE SIZE
5,641 x 4,450 pixels
96 MB
FILE SIZES
18,435 KB (grayscale)
18,445 KB (color)
MAGNIFICATION
21,000x
PIXEL SIZE
2.068 nm
SOURCE
Stanley L. Erlandsen
Department of Genetics, Cell Biology and Development
School of Medicine
University of Minnesota
Minneapolis, MN

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EM 014 Mast Cell

Collagen Fibers

Collagen fibers are bundles of collagen fibrils wich are themselves aggregates of collagen molecules. Each collagen molecule is a twisted helix of three collagen peptides.

Collagen fibrils have a 68 nm banding pattern. This reflects that collagen molecules are staggered to adjacent collagen molecules within fibrils.

Examine the collagen fibrils that surround this cell (TEM).

  • - the banding pattern of fibril is visible.
  • - the diameter of fibrils are relatively uniform within a fiber which varies in different tissues.

Mast cell:

  • (dark green)
  • (blue) / (purple)
  • (yellow)
  • (red)
  • (cyan)
  • (purple) - contents are homogenous and electron-dense
  • Cytoplasm (green)
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