In the zinc finger, which residues in this sequence motif form ligands to a zinc ion?

In the zinc finger, which residues in this sequence motif form ligands to a zinc ion? Correct Answer Cysteine and histidine

In the zinc finger, which is found in a widely varying family of DNA-binding proteins, cysteine and histidine residues in this sequence motif form ligands to a zinc ion whose coordination is essential to stabilize the tertiary structure.
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