Definition: Convert a disfluent question to a proper question. A disfluent question is a question that has some interruptions in it while framing. A proper question is the correct form of the question without any disfluency.
Input: What has the presence of hox genes believe that ctenophores are the sister lineage to what been the focus of for many years?

What has the presence of hox genes been the focus of for many years?