when using keytypes with annotationdbi I am presented with a vector of keytypes available in a given annotation package. I would like to get more documentation for unfamiliar keytypes. I can easily infer what SYMBOL refers to: RB1, THRB, etc. but others are less familiar. Is this information documented in help pages or anywhere else?

Hello, this post is quite old, but I was running into the same issue as I was unclear on what each keytype looks like. Thank you @kayla.interdonato for supplying the previous answer as it is very useful in understanding textually what each keytype represents. My problem was that I still did not know what each keytype visually looked like. I figured out a way to see them.

First, you will want to run keytypes(your Org.db) which will provide you with a list of available keytypes from your particular database. Then you can copy one of the available keytypes and run the following code head(keys(your Org.db, keytpe=the keytype you are interested in)) and you will get back a short list of that particular keytype.

#example
keytypes(org.Hs.eg.db)
head(keys(org.Hs.eg.db, keytypes="REFSEQ"))

I retrieved this answer from the AnnotationDb-objects function website here -> https://www.rdocumentation.org/packages/AnnotationDbi/versions/1.34.4/topics/AnnotationDb-objects under the Examples ## get keys based on unigene comment.

Trying ?AnnotationDbi::ACCNUM should get you a list of available values for 'columns' and 'keytypes' with their given descriptions. Hope this helps!