Vicki L. Chandler, J. Pablo Radicella, Timothy P. Robbins, Jychian Chen, Devon Turks, Two Regulatory Genes of the Maize Anthocyanin Pathway Are Homologous: Isolation of B Utilizing R Genomic Sequences, The Plant Cell, Vol. 1, No. 12 (Dec., 1989), pp. 1175-1183
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Chandler et al. (1989) studied this question.