7.2.2.19	6.5	8.5	at pH 6.5 30% and at pH 8.5 less than 1% of all binding sites are occupied by H+ ions	672636	
7.2.2.19	6.8	7.8	pH 6.8: about 60% of maximal activity, pH 7.8: about 45% of maximal activity	246853