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Each member of the FHL protein family consists of four complete LIM domains and an N-terminal single zinc finger domain, the sequence of the latter corresponding to the C-terminal half of the LIM motif. Histidine and cysteine residues coordinate the binding of two Zn2+ ions per LIM domain, which helps stabilize the secondary and tertiary structure of FHL3 protein. Two isoforms of FHL3 are shown in the figure. Isoform 1 comprises 280 and isoform 2 comprises 172 amino acid residues.
