GENE LOCATION, TIMING, CONCENTRATION. “For instance, DipsCYC2A and DipsCYC2B both shift ventrally in Lonicera sempervirens, a species with a flower that is more radially symmetrical in form than the ‘typical’ Lonicera flower. Likewise, differential expression levels of MIXTA across Antirrhinum species correlate with changes in morphology that influence pollinator preferences.”
http://onlinelibrary.wiley.com/doi/10.1111/nph.13198/full