You are studying a group of cells and found that transcription factor FOX promotes expression of the gene HOUND. You find a group of cells that have abundant amounts of the protein FOX but do not express any of the protein HOUND. What is the most likely explanation for your findings?

FOX promotes the expression of the gene HOUND indirectly.

Explanation:

It is likely that there is another protein (protein X) that is involved. For example FOX maybe increasing the expression of protein X which may activate the expression of the HOUND gene through cell signalling or protein-protein interactions.