000			00252 a2200121 4500
008			151002tMarch-May 1980
245			_aMutation Research
250			_aVol. 70 No. 1-3
260			_aU.S.A.
260			_bELSEVIER
260			_cMarch-May 1980
942			_cBV
999			_c4118 _d4118