Header of PDB file

PDB files contain atomic coordinates plus additional annotations in a header section. The header section is everything before the first record (line) beginning with MODEL or ATOM.

The header section should not be confused with the HEADER record, which is the first line in a PDB file, and always a single line. Here is the HEADER record for 1ijw:

HEADER    DNA BINDING PROTEIN/DNA                 30-APR-01   1IJW

The header section for an X-ray crystallographic model specifies the