Table 1:

Rate constants for hemeproteins containing tyrosine (Tyr) at the active site.

Hemeprotein	kon (M−1s−1)	koff (s−1)
L. pectinata Hemoglobin II (HbII)1	0.4 × 106	0.11
L. pectinata Hemoglobin III (HbIII)1	0.3 × 106	0.08
Ascaris Hemoglobin (AscHb)2	1.52 × 106	0.0041
Mycobacterium tuberculosis TrHb N3	25 × 106	0.199

¹Kraus et al 1990,

²Das et al 2000,

³Couture et al 1999.