Genome sequence data from the opossum <i>Monodelphis domestica</i> fills a gap in our understanding of the evolution of the mammalian immune system.
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<i>Marsupial Genome Sheds Light on the Evolution of Immunity.</i> Hill E, PLoS Biology Vol. 4/3/2006, e75 <a rel="nofollow" class="external free" href="https://dx.doi.org/10.1371/journal.pbio.0040075">https://dx.doi.org/10.1371/journal.pbio.0040075</a>