Example: C2H2 zinc finger DNA binding domain

The characteristic motif of a Cys-Cys-His-His zinc finger DNA binding domain has regular expression

C-X(2,4)-C-X(3)-[LIVMFYWC]-X(8)-H-X(3,5)-H

Here, as in algebra, X is unknown. The sequence of our example domain 1ZNF is as follows, clearly fitting the model.

XYKCGLCERSFVEKSALSRHQRVHKNX

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