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Blue fluorescent homozygous Bf1 seedling leaves fluoresce blue under UV light viewed with red filter; indicating anthranilic acid present. Heterozygous anthers also segregate hence dominant designation.
MaizeGDB reference
Blue fluorescent homozygous bf1 seedling leaf (right) fluoresces blue under UV light viewed with red filter; indicates anthranilic acid present. Heterozygous anthers also fluoresce hence dominant designation. Normal leaf on left.

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