wwPDB validation report of PDB entry 1QSH

HEMOGLOBIN ALPHA CHAIN/HEMOGLOBIN BETA CHAIN
MAGNESIUM(II)-AND ZINC(II)-PROTOPORPHYRIN IX'S STABILIZE THE LOWEST OXYGEN AFFINITY STATE OF HUMAN HEMOGLOBIN EVEN MORE STRONGLY THAN DEOXYHEME

geometric validation package for ligand chemistry in protein x-ray structures

20191225.v01 (using entries in the PDB archive December 25th 2019)