000 00250 a2200121 4500
008 151002tMay-Aug. 1980
245 _aMutation Research
250 _aVol. 78 No. 1-4
260 _aU.S.A.
260 _bELSEVIER
260 _cMay-Aug. 1980
942 _cBV
999 _c4126
_d4126