Proteins · one protein

Hemagglutinin (H1N1 flu)

UniProt P03452 · 565 residues

AlphaFold's confidence, residue by residue: 228 very high (90 and above) · 174 confident (70 to 90) · 102 low (50 to 70) · 61 very low (below 50).

Ask this protein

• What does it look like? 565 residues: 40% very high confidence, 11% very low.
• Where could a drug bind?
• Can I print it and fill it in by hand?

The next questions its numbers invite

• Could it be more than one piece, and how sure are they of each other? It is 565 residues long; long chains are often built from domains.
• What does a single-chain model leave out? Every AlphaFold DB entry is one chain on its own: no partners, metals or cofactors.

These follow-ups come from a short hand-written table that reads only the numbers above: many residues below 50 invites the disorder games; most at 90 or above invites the one about movement. They are questions to try, not findings about this protein.

AlphaFold DB model v1 for UniProt P03452, from Fold Commons' snapshot of 2026-10-04. A prediction, not an experiment.