Marker Free: a Novel Tendency of Transgenic Plants Cre/lox-mediated Marker Gene Excision in Elite Indica Rice Plants Transformed with Genes Conferring Resistance to Lepidopteran Insects Constructed the Cre/loxp Recombination Inducible Excision System and Obtained Marker-free Transgenic Apple Plants Constructed the Cre/loxp Recombination Inducible Excision System and Obtained Marker-free Transgenic Apple Plants A New Cre/lox System for Deletion of Selectable Marker Gene Gene Expression Controlled by Heat-Inducible Site-Specific Recombination in Tobacco DEVELOPMENT OF MARKER-FREE TRANSGENIC POTATO WITH AtMYB12 GENE BY Cre/lox SITE-SPECIFIC RECOMBINATION SYSTEM