Hi Rebecca,<br /><br />thanks. I have another question. In your revised version, you wrote the following sentence,<br />"As an example, ZnO NP has been shown to induce ROS, and Zn ions released from dissolution add to toxicity,<strong> with</strong> and extent increased under natural sunlight as opposed to dark or light in laboratory testing&nbsp;<br /><br />Here I wonder why "with" is needed, is it by a mistake? or is there any reason why you added, "with"? <br />please let me know soon after you see my message.<br /><br />thanks,<br /><br /><br />