Abstract
Recent reports of the crystal structure of the glycoprotein hormone human chorionic gonadotrophin shown taht cystine knots are proving to be versatile structural motifs that enable the construction of variety of proteins with different functional properties. Because of their shape, there appears to be an intrisic requirement for the cystine-knot growth factors to form dimers. This extra level of organization increases the variety of structures built around this simple structural motif
Published Version
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