000			00252 a2200121 4500
008			151002tJune&July 1980
245			_aMutation Research
250			_aVol. 71 No. 1&2
260			_aU.S.A.
260			_bELSEVIER
260			_cJune&July 1980
942			_cBV
999			_c4119 _d4119