[SUGGESTION] - Adding relevant reference to brain annotations.

[GalKepler]

Description of issue

Hello everyone,

I have a suggestion regarding brain annotations. It would be helpful if a relevant reference could be included when retrieving an annotation. This will help new users associate the annotation they are using with the "target" annotation.

I understand that the "source" entity currently corresponds to such references, but a quick search on Google Scholar was not enough for me to associate available annotations with their respective papers.

This reference should not be mandatory as not all of these annotations are published in scientific papers. Also, it may be useful to attach a corresponding "description" of an annotation - a table describing different components of it, as is often available for annotations.

Please let me know your thoughts. I would be happy to contribute to this effort if you think it's appropriate.

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