00287nam a2200097Ia 4500008004100000040001100041245005100052260006100103300001600164300000900180251112s9999||||xx |||||||||||||| ||und||  aCNCLSA 0aProceedings Of The National Academy Of Science  cSeptember 13, 1994bNational Academy Of ScienceaU. S. A  aP.8729-9664  bV.91