Genomic landscape of genes encoding MRJPs. Four scaffolds from the A. mellifera genome project were joined by PCR amplification and sequencing, forming an 883-kb interscaffold (see Results). All 10 mrjp genes are aligned in a tandem array ∼60 kb in size. This, in combination with sequence similarity, suggests a recent series of duplication events in the formation of the MRJP protein subfamily. The mrjp array is flanked by five yellow genes, all but one of which read in the same direction as the mrjp loci. The orientation of the yellow-g and yellow-g2 genes suggests the presence of a shared, bidirectional promoter.