000			00311nam a2200121Ia 4500
008			160509s9999 xx 000 0 und d
020			_a0028-0836
100			_aNature
245			_aNature : 1993 : Volume 361(Jan-Feb) : Shelf 15.4
260			_bNature Publishing Group _c1993
300			_a768p.
650			_aNature
999			_c5517 _d5517