National Center for Biotechnology Information NCBI NLM MEDLINE genetic Molecular RNA humans pubmed abstract nih national institutes of health national library of medicine research support non-u.s. gov't u.s. gov't amino acid sequence Comparative Study P.H.S. DNA x wang DNA-Binding Proteins / metabolism* Nuclear Proteins / metabolism* Receptors Base Sequence Molecular Sequence Data DNA-Binding Proteins / biosynthesis Gene Expression Regulation* Nuclear Proteins / biosynthesis Messenger / biosynthesis transcription messenger / metabolism sequence homology amino acid nucleic acid dna primers cloning recombinant proteins / biosynthesis regulatory sequences repetitive sequences hela cells dna-binding proteins / isolation & purification nuclear proteins / isolation & purification binding sites cell nucleus / metabolism transcription factors* sterol regulatory element binding protein 1 leucine zippers* recombinant proteins / metabolism ldl / genetics* pmid:8402897 c yokoyama m s brown ccaat-enhancer-binding proteins* complementary / metabolism helix-loop-helix motifs* ldl / biosynthesis* nucleic acid*