| Feature | STRAND |
| Definition | Secondary structure: Beta-strand, for example Hydrogen bonded beta-strand, or residue in an isolated beta-bridge |
| Optional Qualifiers |
/NOTE="free text" |
| Comment | This feature is used only for proteins whose tertiary structure is known. Only three types of secondary structure are specified: helices (key HELIX), beta-strands (key STRAND) and turns (key TURN). Residues not specified in one of these classes are in a "loop" or "random-coil" structure. |