I'm looking at various tags right now and I think that some tags, for instance "gene-expression" and "protein-expression", should be merged. How would I go about doing this?
If the tags are only on a handful of questions, just change the tags on those by hand. If it is on 10+ questions you can ask a moderator, we can merge tags without having to edit all the questions by hand.
If we have some tags that are not used in a clear manner and you're unsure about how to proceed, you can always start a discussion about the tags here on meta or in chat.