Lignan: an important natural estrogen from plants THE QUANTIFICATION OF PHYTOESTROGENS IN FRESH PLANT MATERIALS BY REVERSED-PHASE HIGH-PERFORMANCE LIQUID CHROMATOGRAPHY Excretion of estrogens in the livestock and poultry production and their environmental behaviors Research progress of phytoestrogens-like chemical constituents in natural medicines Phytoestrogens in application prospect of treatment of myocardial ischemia/reperfusion injury Research Progression of Animal Gonad and Vitellogenin Under the Influence of Environmental Estrogens