000			00254 a2200121 4500
008			151002tJan.-April 1980
245			_aMutation Research
250			_aVol. 77 No. 1-4
260			_aU.S.A.
260			_bELSEVIER
260			_cJan.-April 1980
942			_cBV
999			_c4125 _d4125