article gene deletion 104 priority journal 80 nonhuman 70 controlled study 64 human 48 Humans 46 Gene Deletion 44 metabolism 42 unclassified drug 38 genetics 36 promoter region 36 Mutation 34 gene mutation 30 phenotype 26 Repressor Proteins 24 Transcription, Genetic 24 Molecular Sequence Data 22 Sequence Deletion 22 enzyme activity 22 Female 20 Promoter Regions (Genetics) 20 female 20 glucose 20 plasmid 20 Animals 18 Escherichia coli 18 bacterial gene 18 gene expression regulation 18 nucleotide sequence 18