TABLE 1.

Reaction rate constants for nitrite reduction by deoxy-hemeproteins

Hemeprotein	Nitrite reduction rate constant
	m−1 s−1
Cytoglobin (human)	0.14, 25 °C, pH 7.0
Hemoglobin (human adult)	0.12 at T state, 6 at R state, 25 °C, pH 7.4 (21)
Myoglobin (horse heart)	6, 25 °C, pH 7.4 (21, 39)
Neuroglobin (human)	0.12, 25 °C, pH 7.4 (40)
Cytochrome c (horse heart)	0.07, 25 °C, pH 7.4a

^a H. Li, C. Hemann, T. M. Abdelghany, M. A. El-Mahdy, and J. L. Zweir, unpublished data.