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An alternative approach to random integration of large DNA fragments into plants is to utilize one of several site - specific recombination ( SSR ) systems , such as Cre / lox .
 GENE: Cre; GENE: lox
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
 GENE: Cre; GENE: lox