Ds-Cbreaker Pro1; (Ds-8L-Cp) Self of original Ac/-, Ds-8L1 Pro1/pro1, Ds-10L2 R1-sc/r segregating for Ds-8L1 Pro1/pro1(cp) and Ds-10L2 R1-sc showing good cases of large Cp vs cp mosaicism, indicating early loss of Ds Pro (3N Ds-8L1/pro/pro kernels). Many kernels of the homozygote pro1 class failed to set seed, causing a semi-sterile appearance of the ear. The Ds Pro/pro/pro class included the mosaic kernels which have reduced clarity of expression because of cross-feeding of mutant tissue by non-mutant sectors (non-cell autonomy).