Abstract
By the cultivation of clone colonies from individual cells of B. prodigiosum [Serratia marcescens] the percentage composition of red to white mutations was investigated. With 10-day-old clone colonies without reference to the colony surface, it was about 20%. The mutation constant proved to differ in different lines. The red or white colony color was traced to a few (possibly only one) mutable genes. The activation energy required for this mutation process can be calculated to about 0.6 e.v.

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