Multiple Assemblies exist for SMTL entry 1yff
STRUCTURE OF HUMAN CARBONMONOXYHEMOGLOBIN C (BETA E6K): TWO QUATERNARY STATES (R2 and R3) IN ONE CRYSTAL; X-RAY DIFFRACTION 2.40 Å

	SMTL ID 1yff.1 Ligands PROTOPORPHYRIN IX CONTAINING FE; CARBON MONOXIDE; PHOSPHATE ION Polypeptides Hemoglobin alpha chain; Hemoglobin beta chain Oligo-state hetero-2-2-mer
	SMTL ID 1yff.2 Ligands PROTOPORPHYRIN IX CONTAINING FE; CARBON MONOXIDE Polypeptides Hemoglobin alpha chain; Hemoglobin beta chain Oligo-state hetero-2-2-mer