<p>The apparent <i>Km</i> and <i>Vmax</i> values were calculated by double-reciprocal plots.</p>a<p>The cyanase reaction was assayed at 27°C, pH 7.7, in the presence of 5 mM KCNO,</p>b<p>The cyanase reaction was assayed at 27°C, pH 7.7, in the presence of 5 mM NaHCO<sub>3</sub>.</p