1.10.3.1	Ca2+	124% activity at 10 mM	727570	
1.10.3.1	Ca2+	highly activates PPO	701760	
1.10.3.1	Co2+	1 mM, slight stimulation	440427	
1.10.3.1	copper	-	686692	
1.10.3.1	copper	a copper-containing enzyme with a dinuclear copper centre	727570	
1.10.3.1	copper	contains copper	727645	
1.10.3.1	copper	the copper centers in the protein are directly involved in the catechol oxidation	657987	
1.10.3.1	Cu+	1 mM, 234% activity	440427	
1.10.3.1	Cu2+	-	672547, 675076	
1.10.3.1	Cu2+	1 mM, 241% activity, enzyme contains 0.24% copper	440427