IgG antibody molecule
An IgG antibody molecule is a Y-shaped protein produced by the immune system to identify and neutralise foreign substances.
Also known as: IgG, immunoglobulin G, antibody
How big is it?
14.5 nm long
Representative maximum molecular span · representative model
Typical recorded range: 13 nm to 16 nm.
A little perspective
Ribosome is about 1.72 times larger on this measurement.
Ribosome: A ribosome is a molecular machine that builds proteins by reading instructions carried by messenger RNA.
Measurements, assumptions & sources +
IgG antibody molecule
A representative immunoglobulin G molecule about 14.5 nm across its maximum projected Y-shaped span. Protein conformation is flexible and the illustration is a molecular surface model, not a hard-edged object.
RCSB Protein Data Bank — Antibody structure
The marked representative maximum molecular span is calibrated. Unmeasured illustration details are representative.
Ribosome
A chosen 25 nm ribosome. Size depends on organism and subunit state.
University of Utah — Cell size and scale
The marked characteristic size is calibrated. Unmeasured illustration details are representative.
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Why this measurement?
Why we use 14.5 nm
For comparison, this page uses representative maximum molecular span. This is labelled representative model: an explicit comparison model rather than a claim that every example has the same value. The recorded range is 13 nm to 16 nm.
A representative immunoglobulin G molecule about 14.5 nm across its maximum projected Y-shaped span. Protein conformation is flexible and the illustration is a molecular surface model, not a hard-edged object.
The marked horizontal span follows the named feature; transparent margins and unmeasured details do not alter it. How calibrated comparisons work →
Recorded properties
IgG antibody molecule dimensions and measurements
| Property | Selected value | Recorded range | Basis |
|---|---|---|---|
| 14.5 nm | 13 nm to 16 nm | representative model |
Around this scale
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These links use compatible length records, ordered around the selected value.
Sources and method
Want to check the number?
The source records and measurement method remain available for inspection.
- RCSB Protein Data Bank — Antibody structureIgG has a flexible Y-shaped architecture; the atlas uses a representative maximum projected molecular span.
There’s always another scale
Follow your curiosity.
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