Description_x000D_ General description_x000D_ Deoxyribonucleic acid (DNA) from placenta and its methylation pattern is indicative of anomalies in the fetal growth. Tobacco smoking during pregnancy favors methylation and epigenetic modulation of placental DNA._x000D_ Application_x000D_ Deoxyribonucleic acid sodium salt from human placenta has been used:_x000D_ • as a standard for optimization of digestion followed by high-performance liquid chromatography (HPLC) and mass spectroscopy_x000D_ • as a standard for ultra violet (UV) spectrophotometer measurements_x000D_ • in polymerase chain reaction (PCR) assay and for standard curve generation for human papillomavirus type 6 quantification_x000D_ Human placenta DNA (hpDNA) is a natural DNA used in studies of DNA binding anticancer agents and DNA binding agents that modulate DNA structure and function. Human placenta DNA is also used in physicochemical studies of DNA behavior in solution.