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CHAPTER 3 - CONNECTIVE TISSUE
Histology Guide
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MICROGRAPH

NAME
EM 308 Collagen Fibrils
TISSUE
Human
IMAGE SIZE
8,292 x 5,708 pixels
137 MB
FILE SIZES
78,753 KB (grayscale)
78,142 KB (color)
MAGNIFICATION
x105,000
PIXEL SIZE
0.2020 nm
SOURCE
Tatsuo Ebe
Shigeru Kobayashi
Niigata University of Medicine
Anatomy Department
Niigata, Japan

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EM 308 Collagen Fibrils

Collagen Fibrils

Transmission electron micrograph (TEM) of collagen fibrils in a longitudinal section. This high magnification image only shows an area of 1.7 x 1.2 µm. For comparison, red blood cells are 7.8 µm in diameter.

Procollagen is synthesized by cells and released into the extracellular matrix. Their ends are trimmed off and three proteins wrap around each other forming a twisted helix. This collagen molecule (also known as tropocollagen) forms collagen fibrils.

A collagen fibril is composed of staggered, parallel collagen molecules. The end of one molecule is offset by 67 nm from the next one. This leads to the periodic D-band pattern (,) which is a structural feature shared by all fibril-forming collagens.

An individual collagen molecule is about 300 nm in length and spans approximately 4.4 of the periodic D-bands.

Type I collagen fibers are aggregates of many fibrils.

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