Whether the categorization of maternal race/ethnicity summarizes genetics or environment. While racial group implies a specific genetic inheritance, ethnicity reflects culture and is therefore changeable. In this study no attempt has been made to distinguish between the two potential effects in the role of maternal ethnic origin as an effect modifier. The strength of this study rests in its use of a large populationbased sample of U.S. women and the availability of information on many potential confounders that may affect the risk of PIH from the natality data. The large sample size provided adequate statistical power to detect significant associations, increased precision in the risk estimates, and the ability to evaluate the potential effect modifying role of maternal race/ethnicity and age. In addition, our study used two independent data sources and observed similar findings albeit with variations in the strength of Remdesivir GS-5734 association for the effect of interest. Using the NIS data from hospital inpatient records, which is superior to birth certificate check boxes further supports and enhances the validity of our study findings. Our study findings suggested important differences by maternal race/ethnicity and age in the association between maternal smoking and PIH. How race/ethnicity modifies this relationship is not clearly understood. It may be explained by a combination of social, behavioral, and genetic polymorphisms and disease susceptibility. While this disparity needs to be confirmed in future studies, our study results may help health professional identify specific subgroups of women who are at higher risk for PIH. Although the pathophysiologic pathways of preeclampsia are largely unknown, separation of women into etiologically homogeneous groups in future studies of preeclampsia may improve our understanding and prediction of the disease. It is plausible that women of different racial and ethnic origins may have different clinical presentations and clinical courses of preeclampsia. More research is needed to establish the biologic and social mechanisms that might explain the variations by maternal age and race/ ethnicity that were observed in our study. Angiotensin II has been implicated in the pathogenesis of various glomerular diseases, such as diabetic glomerulopathy, focal segmental glomerulosclerosis, IgA nephropathy, and others. Ang-II is primarily formed after the cleavage of Ang-I by Ang-converting enzyme. In the kidney glomerulus and other organs, Ang-I can also be converted to other Ang fragments by the action of various peptidases. Neprilysin converts Ang-I into the heptapeptide Ang, whereas aminopeptidase A converts it into the nonapeptide Ang.