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Table 1 Comparisons of the human NOS enzymes

From: Is type 2 diabetes mellitus a vascular disease (atheroscleropathy) with hyperglycemia a late manifestation? The role of NOS, NO, and redox stress.

nNOS NOS-1 Chromosome 12 Amino acids 1434 aa 161 kDa high Ca++ requirement
iNOS NOS-2 Chromosome 17 Amino acids 1153 aa 131 kDa low Ca++ requirement
eNOS NOS-3 Chromosome 7 Amino acids 1203 aa 133 kDa high Ca++ requirement