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Nature Genetics 40, 932–933 (1 August 2008) | doi:10.1038/ng0808-932

H19 in the pouch

Marisa S Bartolomei , Sebastien Vigneau & Michael J O'Neill

In 1991, the first three imprinted genes were described in mice, with H19 and Igf2 as two of the three. For well over a decade, numerous groups have been frustrated by attempts to identify a marsupial ortholog of the H19 noncoding RNA (ncRNA), suggesting that one may not exist.