Research Progress on Biological Effect of Endosulfan Antimutagenicity Screening of Water Extracts from 102 Kinds of Chinese Medicinal Herbs Thinking of revising Ames system suited to invitro mutagenicity test for Chinese materia medica Antimutagenicity Assays of Water Extract from the Fruits of Cnidium monnieri(L.) Cuss. Study on mutagenicity of genistein