text: Like the complex multicellularity seen in animals, the multicellularity of land plants is developmentally organized into tissue and organ units via transcription factor genes with homeotic effects.
  Although plants have homeobox-containing genes, plant homeotic factors tend to possess MADS-box DNA binding domains.
  Animal genomes also possess a small number MADS-box factors.
  Thus, in the independent evolution of multicellularity in plants and animals, different eukaryotic transcription factor families were co-opted to serve homeotic functions. 
  MADS-domain factors have been proposed to function as co-factors to more specialized factors and thereby help to determine organ identity.
  This has been proposed to correspond more closely to the interpretation of animal homeotics outlined by Michael Akam.