Multiple Assemblies exist for SMTL entry 1rbg
CRYSTALLOGRAPHIC STRUCTURES OF RIBONUCLEASE S VARIANTS WITH NONPOLAR SUBSTITUTION AT POSITION 13: PACKING AND CAVITIES; X-RAY DIFFRACTION 1.80 Å

	SMTL ID 1rbg.1 Ligands SULFATE ION Polypeptides RIBONUCLEASE S (S-PEPTIDE); RIBONUCLEASE S (S-PROTEIN) Oligo-state hetero-1-1-mer
	SMTL ID 1rbg.2 Ligands SULFATE ION Polypeptides RIBONUCLEASE S (S-PEPTIDE); RIBONUCLEASE S (S-PROTEIN) Oligo-state hetero-2-2-mer