How many transcription factors are there? In molecular biology and genetics, a transcription factor is a protein that binds to specific DNA sequences, thereby controlling the flow (or transcription) of genetic information from DNA to messenger RNA. My question is simply how many transcription factors are there in the genomes of: * Humans * Anopheles gambiae (or it's close taxonomic relatives) * Less prioritized: any other species

This is the Curated database of mouse and human transcription factors. And this is the paper in which they describe how they curated the database. In summary, there are 3230 putative mouse TF, 1200 of which are described in scientific papers.