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The nuclear hormone receptor ligand binding domain is a good example.

See Wurtz et al., Nature Structural Biology vol. 3, 1996, pp 87-94
and Renaud et al., Nature vol. 378, 1994, pp. 681-689.

Good luck,

Donald Doyle
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 Donald F. Doyle, Ph.D.				[email-masked]
 Howard Hughes Medical Institute		Phone: (214) 648-6787
 UT Southwestern Medical Center			Fax:   (214) 648-5095
 5323 Harry Hines Blvd. Y4.320
 Dallas, TX 75235-9050
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