Abundance, Distribution, and Transcriptional Activity of Repetitive Elements in the Maize Genome

↵A set of 652 BACs was scored for the presence or absence of each of the listed retrotransposon families, using the same probes listed in Table 2. The coincidence of each pair of families is indicated in the table as a value for the Pearson correlation coefficient. The values above the diagonal were calculated with the assumption that 12% of the BAC clones had no insert (estimated from fingerprinting data; see text for details), while the values below the diagonal assume that a maximum 22% of the clones had no insert (assuming that all BACs not hybridizing to any repeat had no insert). The significance of each comparison was also determined by an independence chi-square test and is indicated next to the correlation coefficient: * is significant at 5%; ** is significant at 1%; and *** is significant at 0.1%.