Abstract
Summary
Among the germinal mutations induced in mice following the subcutaneous injection of methylcholanthrene for many generations is hereditary dwarfism. This condition is inherited as a recessive. The relation of this mutation to the general problem of parallel induction is briefly indicated. Thus it is becoming more obvious that both nongenetic and genetic biological variants are being produced in mice by methylcholanthrene. The mechanism involved may be different for the different variants obtained but perhaps there may be a common denominator in them all.
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