The phrase "are found" is a common way of expressing the discovery or presence of something. However, there are several synonyms for this phrase that can make your writing more interesting and varied. Some alternatives include "exist," "occur," "can be located," "are uncovered," "are revealed," "are discovered," "are detected," and "are identified." By using these synonyms, you can add nuance and depth to your writing and convey your ideas in a more precise and engaging way. So next time you need to express the idea of something being present or discovered, try out one of these alternatives to "are found".