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 VHF stations to Buffalo (WKBW-TV, channel 7) and Hartford (WTIC-TV channel 3, now WFSB), NBC decided that its experiment was a lost cause, and put WBUF and WNBC up for sale. While it found a buyer for WNBC (which retained its NBC affiliation), there were no takers for WBUF, and it went off the air in 1958. NBC then affiliated with WGR-TV, where it remains to this day. NBC donated WBUF's license and some of its equipment to PBS member station WNED-TV, which took over the channel 17 frequency in 1959 (due to a number of transactions, the WBUF-TV license