1	S3F	Oxidized [fe4-s3] cluster	1.000
2	9S8	Non-cubane [4Fe-4S]-cluster	0.778
3	ER2	Fe4s4	0.778
4	MSK	Broken Fe4S4 cluster	0.778
5	RQM	Fe(3)-ni(1)-S(4) cluster	0.700
6	XCC	Fe(4)-ni(1)-S(4) cluster	0.700