In accordance with the Brookhaven Protein Data Bank, the entry for atoms is defined as follows:
ATOM 837 HG23 THR 1055 -8.573 5.657 -3.818 1.00 0.00 A HETATM 1223 O GLY 153A -11.704 -9.200 .489 1.00 0.80 1MOL uuuuu vvvv uuuuCuuuuI vvvvvvvvuuuuuuuuvvvvvvvvuuuuuuvvvvvv uuuu atom residue x y z q b segid number name name number ^ insertion character ^ chain identifier ^ additional character for some atom names (mostly h's)
CNS will read but ignore all PDB records apart from:
REMARK ATOM HETATM END