Abstract: The invention provides a method of predicting a three dimensional structural representation of a target protein of unknown structure, or part thereof, comprising: providing the coordinates of the turkey ?1-AR structure listed in Table A, Table B, Table C or Table D, optionally varied by a root mean square deviation of residue backbone atoms of not more than 1.235 A, or selected coordinates thereof; and predicting the three-dimensional structural representation of the target protein, or part thereof, by modelling the structural representation on all or the selected coordinates of the turkey ?1-AR. The invention also provides the use of the turkey ?1-AR coordinates to select or design one or more binding partners of ?1-AR.