Methylation statuses of two pairs of hemizygous alleles, i.e. before and after Alu insertions. a) chr10:72605338-72605440 locus; b) chr2:48276482-48276601 locus. Schemes on the left side represent the allele not containing the Alu insertion, while the figure on the right side represents the allele in which the Alu element inserted. The blue arrow indicates the probable site of Alu integration; CG and asterisk indicate the CpG dinucleotides that are flanking the Alu element; red bar indicates the Alu element that was inserted.