Long-term contraception subdermal implant made bylevonorgestrel and silastic tube have the adventure oflong-term use,high quality,good recovery afterremoving.It is a very popular contraceptive method.Forsafety of using implant,the mutagenic effects of implantin Ames-test,Micronucleis-test and on Chinese HamsterOvary(CHO) Cell is reported.
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