Evolution National Center for Biotechnology Information NCBI NLM MEDLINE gene expression gene expression regulation animals pubmed abstract nih national institutes of health national library of medicine research support non-u.s. gov't amino acid sequence sequence alignment DNA Molecular* Genes Sequence Analysis Molecular Sequence Data complementary / genetics sequence homology amino acid dna-binding proteins / physiology dna-binding proteins / genetics transcription factors / genetics transcriptional activation drosophila melanogaster / genetics transcription factors / physiology zebrafish / genetics complementary / chemistry dna / genetics forkhead transcription factors pmid:11054532 doi:10.1016/s0378-1119(00)00344-9 t schlake m schorpp t boehm chordata nonvertebrate / genetics dna / chemistry regulator / genetics* regulator / physiology