000 00252 a2200121 4500
008 151002tNov.&Dec. 1980
245 _aMutation Research
250 _aVol. 73 No. 1&2
260 _aU.S.A.
260 _bELSEVIER
260 _cNov.&Dec. 1980
942 _cBV
999 _c4121
_d4121