Epigenetic regulation of transposable elements in the plant kingdom which allows for self-copying) within the coding of the transposon defines class I elements as autonomous or non-autonomous. Class I transposons can take the form of: Curiously, retrotransposons have been discovered to be the predominant form of transpositional element in plants with large genomes, such as maize and wheat, potentially indicating rapid success of this class of transposon in the creation of hybrids, such as wheat, peppermint and, in the distant past, maize. Plant hybridization often creates polyploids, with double, triple, quadruple or more the number of chromosomes present in the parent generation. Polyploid hybrids seem to be particularly susceptible
Owned-and-operated television stations in the United States the network in order to avoid having to finance shutdown costs for The WB. ACME Communications, which operated WB-affiliated stations in small and mid-sized markets, was owned by Jamie Kellner, the network's president from its 1995 launch until 2001. However, neither Time Warner or Tribune considered the ACME stations on the same level as the Tribune stations, nor did Time Warner have any interest in the stations outside of traditional affiliation agreements, or vice versa did ACME have any interest in Time Warner. The ACME stations were among the first awarded "de facto" affiliations for The CW when the network