1	ER2	Fe4s4	1.000
2	F3S	Fe3-s4 cluster	0.875
3	F4S	Fe4-s3 cluster	0.875
4	SF3	Fe4-s3 cluster	0.875
5	35L	Iron/sulfur cluster	0.778
6	9S8	Non-cubane [4Fe-4S]-cluster	0.778
7	MSK	Broken Fe4S4 cluster	0.778
8	S3F	Oxidized [fe4-s3] cluster	0.778
9	SF4	Iron/sulfur cluster	0.778
10	WCC	Fe(3)-ni(1)-S(4) cluster	0.778
11	ZKP	Fe3-s4 methylated cluster	0.778
12	8JU	Fe4-s4-O cluster	0.700
13	CUV	Fe(4)-ni(1)-S(4) cluster, oxidized	0.700
14	Q46	Fe4 H s5	0.700
15	RQM	Fe(3)-ni(1)-S(4) cluster	0.700
16	XCC	Fe(4)-ni(1)-S(4) cluster	0.700