Cellular Memory Modules (CMMs) is is the ability of cells to remember and propagate their gene expression programs throughout the entire development. This basic developmental function has been conserved during evolution, as related mechanisms were identified in other model organisms<ref>Maurange C. and Paro R., 2002. A cellular memory module conveys epigenetic inheritance of hedgehog expression during Drosophila wing imaginal disc development. GENES & DEVELOPMENT, 16:2672–2683