The group "cis" to the peroxide oxygen in the transition state structure then migrates preferentially, thus explaining the retention of configuration at the carbon center.
For instance, lysosomes contain enzymes that break down the contents of food vacuoles, and peroxisomes are used to break down peroxide, which is toxic otherwise.
Once there, the antimicrobial action of superoxide and hydrogen peroxide, derived from the metabolic processes of the neutrophils, act to combat the microbial invasion.