Gene silencing mediated by promoter homology occurs at the level of transcription and results in meiotically heritable alterations in methylation and gene activity. - Park, ,Y.-D.,.; Papp, ,I.,.; Moscone, ,E..A.,.; Iglesias, ,V..A.,.; Vaucheret, ,H.,.; Matzke, ,A..J. M.,.; and Matzke, ,M..A.. (Plant J., 1996)