Table 1. Ligand binding properties of ApPgb compared with sperm whale myoglobin and the Ascaris hemoglobin.

	CO		NO
	kon, μM−1·S−1	koff, S−1	kon (FeII), μM−1·S−1	kox, h−1
ApPgb	11*	0.047*	60*	9.7*†
SWMb	0.55‡	0.019‡	20‡	0.06§
Ascaris Hb	0.17¶	0.018¶	6.5‡	2.4∥

^*This study; pH 7, 25 °C. Error is ± 15%.

^†In air.

^‡Ref. 38; pH 7, 20 °C.

^§Ref. 17; pH 7, 37 °C (in air).

^¶Ref. 39; pH 7, 20 °C.

^∥Ref. 40; pH 6, 12 °C (in air).