There is concern in health-related government agencies that the American diet contains too much meat, and numerous recommendations have been made urging people to consume more fruit and vegetables. One of the richest sources of vegetable protein is soy, available in many forms. Among these is soybean curd, or tofu, which is a staple of many Asian diets. Chemists have isolated an anticancer agent called genistein from tofu, which may explain the much lower incidence of cancer among people in the Far East. A valid Lewis structure for genistein is:
(c) How many carbon-oxygen π bonds are there? How many carbon-oxygen p bonds?

An isoflavone and phytoestrogen with anticancer properties, genistein is generated from soy. The protein-tyrosine kinase that genistein binds to and inhibits prevents signal transmission and promotes cell differentiation. Additionally, this substance stimulates G2/M cell cycle arrest and inhibits topoisomerase-II, which causes DNA breakage and apoptosis. Antioxidant, antiangiogenic, and immunosuppressive properties of genistein are present. a soy product-derived isoflavonoid. As an antineoplastic and anticancer drug, it inhibits the activity of topoisomerase-II (DNA topoisomerases, type II) and protein tyrosine kinase. It has been demonstrated through experimentation to cause G2 phase arrest in human and murine cell lines. Genistein also possesses antihelmintic properties. It has been established that Felmingia vestita, a plant historically used to treat worms, contains it as an active component.

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