PDB format ?
HEADER records such as COMPND/SOURCE with the
in-complete ribosome X-ray diffraction result from one experiment, contained in the 2 PDB entries1GIY and 1GIX ---> combined breaks format rules!
COMPND 146 MOLECULE: 50S RIBOSOMAL PROTEIN L30;
^^^ illegal only columns 9-10
allow for concatenation of