Response to the phenomenon: There is a whiteprecipitate is generated, the solution was colorless;
反应现象：有白色沉淀生成，溶液呈无色；
2
The favorable peculiarity of this method is that it can demonstrate the absence of the target gene by the production of whiteprecipitate of magnesium pyrophosphate .
该方法的一大特色是，可以通过反应副产物-白色焦磷酸镁沉淀的产生与否判断靶基因的存在。
3
When we pass an excess of carbon dioxide into the limewater, the whiteprecipitate disappears. This is because the precipitate dissolves to form soluble calcium hydrogencarbonate.