OUTSOURCED FUNCTIONS. “It is also evident that certain functions vital for protecting transgenerational genome integrity in animal germ cells, such as the suppression of transposition in the germ cell genome, has been partially “outsourced” to gametophytic helper cells in plants.” (Targeted at suppressing parasitic mobile genetic elements by transposing silencing).
http://www.sciencedirect.com/science/article/pii/S1534580713000427