The protein structural motif domain- helix loop helix are contained by all of the following except ________

The protein structural motif domain- helix loop helix are contained by all of the following except ________ Correct Answer Leucine zipper

Leucine zipper is associated with gene regulation and contains alpha helix with leucine at every 7th amino acid. While rest of them are under one of the largest families of dimerizing transcription factors.
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