Fig. 3. P₅₀ (O₂ tension at half O₂ saturation) and n₅₀ (Hill cooperativity coefficient at P₅₀) values of Symenchelis parasitica hemolysate (He, dotted line), Hb I (dashed lines) and Hb II (continuous lines) and their pH dependence in the absence of effectors and in the presence of 0.1 mol l^-1 KCl, saturating ATP levels and peptide corresponding to the 10-mer amino-terminal segments of the cytoplasmic domain of Band 3 protein (cd-B3) from trout red cell membranes (peptide/Hb tetramer molar ratio=5) measured at 25°C (A) and 5°C (B). Other conditions are as described in the legend to Fig. 2. (7.50 Torr=1 kPa.)