Recurring protein structures characterized by 20 amino acids folding into two alpha helices connected by a non-helical "loop" segment

Helix-loop-helix transcription factors / Trevor D. Littlewood and Gerard I. Evan.

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Helix-Loop-Helix Motifs

Works from the collections

Helix-loop-helix transcription factors / Trevor D. Littlewood and Gerard I. Evan.