OBJECTIVE To investigate the levels of serum NO,TNOS,iNOS,eNOS in Han and Uygur nationalities,and analyze the relationship of serum NO levels with the gender and BMI.METHODS Serum NO was measured by the technique of nitrate reductase,serum TNOS and iNOS were measured by spectrophotography,eNOS were detected by ELISA.RESULTS The serum of NO and TNOS and iNOS and eNOS concentrations were 56.9+7.9 μmol·L-1;26.6+4.5 U·mL-1;21.6+4.9 U·mL-1;5.7+4.0 U·mL-1 in Han nationality respectively and 51.5+7.7 μmol·L-1;21.5...