Complex sentence: The most commonly used technique is the Cre-Lox recombination system.The Cre recombinase enzyme specifically recognizes two lox (loci of recombination) sites within DNA and causes recombination between them.
Split into simpler sentences: The most commonly used technique is the Cre-Lox recombination system. The enzyme Cre recombinase is a site-specific recombinase, which recognizes two lox (loci of recombination) sites within DNA and causes recombination between them.