What Are Protein 3D Structure Data?

Caveat: "Structure" in bioinformatics can mean sequence structure or 3D structure.
    Atomic Coordinates
    + Chemical and Protein Annotations
    (element, amino acid name, position in amino acid, chain, sequence number):
  1. 4 Amino Acids (65 atoms).
  2. 3D Data as Text.
  3. A Small Protein (56 amino acids, ~1000 atoms).

by Eric Martz, University of Massachusetts, September 2005.
Minor revisions April 2012.