Id	Element	Ion	Binding family	Amino acids or nucleotide residues names	All bound residues	Is homomer	Number of bound amino acids or nucleotide residues	Number of all bound residues	Number of coordinating chains	Representative
4YZX-CA-1	CA	Ca²⁺	E1N1Q1X1	ADA.ASN.GLN.GLU.	ADA.ASN.GLN.GLU.HOH.	✘	4	6	2	✔
4YZX-CA-2	CA	Ca²⁺	E2X2	ADA.GLU.	ADA.GLU.HOH.	✘	4	5	2	✔
4YZX-CA-3	CA	Ca²⁺	D2E1X1	ADA.ASP.GLU.	ADA.ASP.GLU.HOH.	✘	4	6	2	✔
2HLO-CA-1	CA	Ca²⁺	D2E1G1	ASP.GLU.GLY.	ASP.GLU.GLY.HOH.	✘	4	5	2	✘
2H61-CA-1	CA	Ca²⁺	D1L1S1	ASP.LEU.SER.	ASP.HOH.LEU.SER.	✘	3	6	2	✔
2H61-CA-2	CA	Ca²⁺	D1S1	ASP.SER.	ASP.HOH.SER.	✘	2	4	2	✘
2I0F-CA-1	CA	Ca²⁺	A1D1	ALA.ASP.	ALA.ASP.	✔	2	2	2	✔
2I3Q-CA-1	CA	Ca²⁺	A1D1G2	ASP.DA.DG.GLY.	ASP.DA.DG.GLY.HOH.	✘	4	6	4	✘
2I3Q-CA-2	CA	Ca²⁺	C1D1G2	ASP.DC.DG.GLY.	ASP.DC.DG.GLY.HOH.	✘	4	5	4	✘
2I3P-CA-1	CA	Ca²⁺	A1D1G2	ASP.DA.DG.GLY.	ASP.DA.DG.GLY.HOH.	✘	4	5	4	✘
2I3P-CA-2	CA	Ca²⁺	C1D1G2	ASP.DC.DG.GLY.	ASP.DC.DG.GLY.	✘	4	4	4	✔
2I52-CA-1	CA	Ca²⁺	E2	GLU.	HOH.THR.	✔	2	6	2	✔
2I52-CA-2	CA	Ca²⁺	E2	GLU.	HOH.THR.	✔	2	6	2	✘
2I5W-CA-1	CA	Ca²⁺	C2V1	CYS.DC.VAL.	CYS.DC.VAL.	✘	3	3	2	✔
2DOB-CA-1	CA	Ca²⁺	D2	ASP.	ASP.HOH.	✔	2	6	2	✔
2DOB-CA-2	CA	Ca²⁺	D2	ASP.	ASP.HOH.	✔	2	6	2	✘
2DPR-CA-1	CA	Ca²⁺	X3	CGU.	CGU.HOH.	✔	3	4	2	✔
2DPR-CA-2	CA	Ca²⁺	X4	CGU.	CGU.HOH.	✔	4	6	2	✔
2DPR-CA-3	CA	Ca²⁺	X4	CGU.	CGU.HOH.	✔	4	6	2	✘
2DPR-CA-4	CA	Ca²⁺	X3	CGU.	CGU.HOH.	✔	3	4	2	✔