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Definitions of zinc finger:

A structural motif of DNA-binding proteins in which finger-like loops of amino acids are stabilized with zinc atoms.
xray.bmc.uu.se/~kenth/bioinfo/glossary.html
Configuration of a DNA-binding protein that resembles a finger with a base, usually cysteines and histidines, binding a zinc ion. Discovered in a transcription factor in Xenopus but present in a large number of different proteins.
helios.bto.ed.ac.uk/bto/glossary/tuvwxyz.htm
(protein): a protein motif involved in the recognition of DNA; the structure contains a complex zinc ion and consists of an antiparallel protein-chain hairpin and loop followed by a helix gene
www.desicca.de/plant_breeding/Dictionary/Dictionary_Z/hauptteil_dictionary_z.html
A zinc finger is part of a protein that can bind to DNA. Zinc finger domains typically consist of two β sheets, each carrying a cysteine residue, and an α helix carrying two histidine residues. The cysteine and histidine residues bind a zinc atom.
en.wikipedia.org/wiki/Zinc_finger