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If a Journal allows highlights in the article, then authors are encouraged to use them. Highlights are a series of bullet points and their function is to make it easier for the reader to judge the value or their own interest in the article. A powerful set of highlights could greatly increase the chance that someone will read your article; so you are advised to think carefully about what you write. It is very important to ensure they portray the core findings of your article.

This example here clearly lists what the reader can expect to discover in the article. Check the 'Guide for Authors' for specific guidelines on number of bullet points allowed, and maximum number of characters, for example.