6.3.4.6	ATP + urea + CO2	activity is inducible by urea, acetamide or formamide	
6.3.4.6	ATP + urea + HCO3-	-	
6.3.4.6	ATP + urea + HCO3-	enzyme is involved in urea cleavage	
6.3.4.6	ATP + urea + HCO3- + H+	-