<prompt> Leucine zipper complex isB cell epitomesReceptor ligand proteinDNA binding proteinMembrane attack complex  <response>: Proteins that bind to DNA contain a limited number of motifs.The helix-loop-helix motif is an example found in a number of proteins that function in a number of proteins that function as transcription factors Example: zinc fingers, and leucine zippers . REF :LIPPINCOTTS TEXTBOOK OF BICHEMISTRY ;8th EDITION ;Page no :18 AND 422. 