Table 1. g-Values and Maximal Proton Coupling for Cryoreduced Ferrous-Oxy hIDO, sIDO, XcTDO, H55S XcTDO, and the Oxyglobins.

complex	species	g1	g2	g3	Amax (MHz)
[hIDOII-O2]	A	2.320	2.170	1.947	10
	B	2.35	2.26	1.922	9
	other	2.3−2.2
[sIDOII-O2]	A	2.32	2.20	1.94
	B	2.30	2.18	1.95
	C	2.27	2.16	∼1.95
[hIDOII-Trp-O2]		2.27	2.17	1.946	15
[hIDOII-Me-Trp-O2]		2.27	2.173	1.946	15
[XcTDOII-5F-Trp-O2]		2.27	2.17	1.95	15
[H55SXcTDOII-Trp-O2]		2.27	2.17	1.95	15
[H55SXcTDOII-Me-Trp-O2]		2.27	2.17	1.95	15
HbA oxy β-chains	peroxy	2.25	2.14	1.95	21
	hydroperoxy	2.31	2.16	1.93	12