Animals 34 article 30 nonhuman 28 priority journal 26 Enhancer Elements, Genetic 24 enhancer region 24 Base Sequence 20 Humans 18 Molecular Sequence Data 18 gene expression 18 Gene Expression Regulation 16 Enhancer Elements (Genetics) 14 Evolution, Molecular 14 Gene Expression Regulation, Developmental 14 Mammalia 14 Mammals 14 molecular evolution 14 Mice 12 Neurons 12 Pro-Opiomelanocortin 12 controlled study 12 embryo 12 proopiomelanocortin 12 reporter gene 12 Animalia 10 Conserved Sequence 10 Mice, Transgenic 10 Mus musculus 10 Transcription, Genetic 10 animal cell 10