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Red color pattern variation in Heliconius maps to the optix locus. (A) Map showing the geographical distribution of major red color pattern types of H. erato, along with the comimic H. melpomene. Two major phenotypes, radiate and postman, comprise the majority of red color patterns in the 2 species. (B) Phylogenetic weighting plot between radiate and postman H. erato populations shows loci separating these 2 morphs around the gene optix.
