Relation information includes the following:

Sentence describing the relationship: e.g., metformin has a negative regulation relationship with diabetes mellitus

One or more text snippets: text from the article that was interpreted by automatic indexing to include the relationship. Snippets can be useful to see the context of the relationship and determine its relevance to your work.
(Clinical trials do not have text snippets)

Link to additional references mentioning the relationship: opens up a new window of articles/trials that include the specific relationship and can be a useful indicator of how well studied/known is a relationship

Secondary relationships: additional relationships found in the record that are not directly related to your search or filters. Secondary relationships give you an idea of what else is covered in the article/clinical trial.