Multiple Assemblies exist for SMTL entry 1s18
Structure and protein design of human apyrase; X-RAY DIFFRACTION 1.70 Å

	SMTL ID 1s18.1 Ligands CALCIUM ION; ACETATE ION; 2-AMINO-2-HYDROXYMETHYL-PROPANE-1,3-DIOL Polypeptides apyrase Oligo-state monomer
	SMTL ID 1s18.2 Ligands CALCIUM ION; ACETATE ION; 2-AMINO-2-HYDROXYMETHYL-PROPANE-1,3-DIOL Polypeptides apyrase Oligo-state monomer