En(Active) in inbred 4Co63 --Peter A. Peterson In extensive screening of numerous populations, only Uq and Mrh have generally been found. In an accidental crossing with a W23/4Co63 hybrid, every ear showed mutability when crossed with c-m(r). In order to distinguish which of the two lines carried the En, c-m(r) was crossed to the individual inbreds. Every plant (from 4Co63) (9/9 tested) carried En and in the homozygous condition. This is surprising since even with Uq or Mrh, rarely do all the plants have the element and even more rarely, in the homozygous condition.

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