Peg12 (Frat3, frequently rearranged in advanced T-cell lymphomas 3) shows paternal expression in
JH et al, 2001; Kobayashi
S et al, 2002). Peg12, a single exon gene that is related to Frat1 and Frat2, was derived from a
recent L1-mediated retrotransposition event, estimated to have occurred ~18–26 million years ago,
around the time of the
divergence of Mus-Rattus (Chai
JH et al, 2001).