Zinc Finger This is a zinc finger domain from a larger transcription factor. This is the most prevalent domain coded for in the human genome. The Zinc holds the 2 strands, sometimes seen as beta-strands, next to the alpha-helix. Elrod-Erickson, M., Rould, M. A., Nekludova, L., Pabo, C. O.: Zif268 protein-DNA complex refined at 1.6 A: a model system for understanding zinc finger-DNA interactions. Structure 4 pp. 1171 (1996) (PubMed) 1aay (PDB)