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The phenotype of sugar beet (B. vulgaris) seedlings homozygous for a mutation in the RED gene. Betalain deficient plants (right) do not show any red pigmentation, the hypocotyl appears green due to the lack of betalain pigments. The two phenotypes are easy to distinguish, since homozygous plants show either a fully expressed red color in the hypocotyl, or a complete lack of it. RR and rr, genotype of the respective seedling
