From Animal science blog:
Marsupial Genome Sequenced
A report in Nature has announced that the first marsupial genome has been sequenced.
Tarjei Mikkelsen of the Broad Institute in Cambridge, Mass and team sequenced the 3,475 megabase genome of the South American grey short-tailed opossum, Monodelphis domestica.
The opossum genome appears to contain about 20,000 protein-coding genes, the authors found, and the vast majority of these are also found in placental mammals. Apparently most of the differences between marsupial and placental mammals comes from junk. ahem. non-coding sequences, not proteins. It provides more evidence the main difference between you and other animals is how your genes are regulated not the proteins you possess.
See also here.
Species diversity in the Monodelphis brevicaudata complex (Didelphimorphia: Didelphidae) inferred from molecular and morphological data, with the description of a new species: here.
Leucistic North American opossum: here.
Genomes of Neanderthals and mammoths: here.