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Extinct May No Longer Mean Forever

An international team of scientists has sequenced the DNA of two extinct Tasmanian "tigers," finding that the two animals were extremely similar to each other with only five differences in 15,492 nucleotides. Their findings suggest that the Australian marsupials, which looked like dogs but were evolutionarily more closely related to kangaroos and koalas, died out about 70 years ago because they may have become too inbred to survive. "Our goal is to learn how to prevent endangered species from going extinct," says co-author Web Miller, in a BBC story.

The Scan

Pig Organ Transplants Considered

The Wall Street Journal reports that the US Food and Drug Administration may soon allow clinical trials that involve transplanting pig organs into humans.

'Poo-Bank' Proposal

Harvard Medical School researchers suggest people should bank stool samples when they are young to transplant when they later develop age-related diseases.

Spurred to Develop Again

New Scientist reports that researchers may have uncovered why about 60 percent of in vitro fertilization embryos stop developing.

Science Papers Examine Breast Milk Cell Populations, Cerebral Cortex Cellular Diversity, Micronesia Population History

In Science this week: unique cell populations found within breast milk, 100 transcriptionally distinct cell populations uncovered in the cerebral cortex, and more.