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Localization of P2 OR gene loci in constitutive heterochromatin and euchromatin. (A) Representative immuno-DNA FISH images of an olfactory nucleus showing the staining for H3K9me3 (in green) and the P2 OR gene loci (in red). Only one of the P2 OR gene alleles is associated with H3K9me3. (B) Same as in A but staining for H3K4me3 is shown in green. One of the P2 OR gene alleles is associated with the constitutive heterochromatin block, and the other one is associated with H3K4me3.
