00281nam a2200109Ia 4500008004100000040001100041100001800052245003300070260004100103300001700144300001000161251112s9999||||xx |||||||||||||| ||und||  aCNCLSA  aJ. C. Kendrew 0aJournal of Molecular Biology  cJuly, 1993bpergamon pressaNew York  aP. 4159-4794  bV. 67