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
4EX9-CA-3	CA	Ca²⁺	D1E2	ASP.GLU.	ASP.GLU.HOH.	✔	3	4	2	✘
4EX9-CA-4	CA	Ca²⁺	D3	ASP.	ASP.	✔	3	3	3	✔
4FBU-CA-1	CA	Ca²⁺	C1D1E1	ASP.DC.GLU.	ASP.DC.GLU.	✘	3	3	2	✔
4FE1-CA-1	CA	Ca²⁺	D1F1P1	ASP.PHE.PRO.	ASP.PHE.PRO.	✔	3	3	2	✘
4FE1-CA-2	CA	Ca²⁺	D1F1P1	ASP.PHE.PRO.	ASP.PHE.PRO.	✔	3	3	2	✘
4FE1-CA-3	CA	Ca²⁺	D1F1P1	ASP.PHE.PRO.	ASP.PHE.PRO.	✔	3	3	2	✘
4FGC-CA-1	CA	Ca²⁺	D1R2	ARG.ASP.	ARG.ASP.HOH.	✔	3	7	2	✔
4FGC-CA-2	CA	Ca²⁺	D1R2	ARG.ASP.	ARG.ASP.HOH.	✔	3	7	2	✘
4FGC-CA-3	CA	Ca²⁺	D1R2	ARG.ASP.	ARG.ASP.HOH.	✔	3	5	2	✘
4FGC-CA-4	CA	Ca²⁺	D1R2	ARG.ASP.	ARG.ASP.HOH.	✔	3	5	2	✘
4FGC-CA-5	CA	Ca²⁺	D1R2	ARG.ASP.	ARG.ASP.HOH.	✔	3	7	2	✔
4FGC-CA-6	CA	Ca²⁺	D1R2	ARG.ASP.	ARG.ASP.HOH.	✔	3	7	2	✘
4FGC-CA-7	CA	Ca²⁺	D1R2	ARG.ASP.	ARG.ASP.HOH.	✔	3	7	2	✘
4FGC-CA-8	CA	Ca²⁺	D1R2	ARG.ASP.	ARG.ASP.HOH.	✔	3	7	2	✘
4G01-CA-1	CA	Ca²⁺	D1P1S1	ASP.PRO.SER.	ASP.GDP.HOH.PRO.SER.	✘	3	7	2	✔
3QHQ-CA-1	CA	Ca²⁺	A1D1E2	ALA.ASP.GLU.	ALA.ASP.GLU.HOH.	✔	4	6	2	✔
3QHQ-CA-2	CA	Ca²⁺	A1D1E2	ALA.ASP.GLU.	ALA.ASP.GLU.HOH.	✔	4	6	2	✘
3QHQ-CA-3	CA	Ca²⁺	D2E2	ASP.GLU.	ASP.GLU.HOH.	✔	4	6	2	✔
3QHQ-CA-4	CA	Ca²⁺	D2E2	ASP.GLU.	ASP.GLU.HOH.	✔	4	6	2	✘
3QHQ-CA-5	CA	Ca²⁺	A1D1E2	ALA.ASP.GLU.	ALA.ASP.GLU.HOH.	✔	4	6	2	✘