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One tomato (Lycopersicon esculentum) gene,LAT52,has been proved to be suitable for the endogenous reference gene of genetically modified (GM) tomato detection in our previous study.Herein we report the results of collaborative ring trial for international validation of the LAT52 gene as endogenous reference gene and it analytical systems,fourteen GMO detection laboratories from eight countries were invited,and we finally received the results from thirteen ones.