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Micro World

How small is a fibrinogen molecule?

A fibrinogen molecule is about 45 nm long.

What is measured: blood clotting protein, rod length

Fibrinogen Molecule (45 nm) drawn to scale beside a ribosome (25 nm) and a flu virus (100 nm)
Drawn to scale, from left to right: Ribosome (25 nm), Fibrinogen Molecule (45 nm) and Flu virus (100 nm).

Compare

How big is that, really?

  • About 1.8× the width of a ribosome
  • About 2 would fit across a flu virus
  • About 23× the width of a DNA double helix

Learn

Facts about Fibrinogen Molecule

Fibrinogen converts into fibrin strands that form the mesh of a blood clot.

Source: PDB: Fibrinogen structure; RCSB Molecule of the Month

Micro World

NameSizeCompared with Fibrinogen Molecule
Bacteriophage Phi X17427 nm0.6×
Qβ Bacteriophage28 nm0.62×
Silver Nanoparticle40 nm0.89×
Fibrinogen Molecule45 nmthis page
Silicon Nanowire50 nm1.1×
West Nile Virus50 nm1.1×
Human Papillomavirus55 nm1.2×
Cyanophage P-SSP760 nm1.3×
Silica Nanoparticle100 nm2.2×
Titanium Dioxide Nanoparticle100 nm2.2×

Test your sense of scale

Which is bigger: Fibrinogen Molecule or Human Papillomavirus?

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