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This feature in the bz2-mu2 big spot line is completely atypical of standard Mutator lines and would be readily noticed with any anthocyanin reporter allele . Based on a previously published study of the anthocyanin content of black beans , Beninger found that the levels of anthocyanins per 100 gm serving size of black beans was about 10 times the amount of overall antioxidants in an equivalent serving size of oranges and similar to the amount found in an equivalent serving size of grapes , apples and cranberries . Moreover , insulin-producing tissue in animals eating the anthocyanin supplement remained healthy , a sign they were n't becoming prediabetic . It is presently unknown whether this anthocyanin accumulation is due to sporophytic or gametophyte gene expression . Five days after germination they were exposed to light for 4 hours and the anthocyanin content of the scutellar node was then determined .