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'Most Carefully Considered'

Medical research would be much harder without animal subjects, and researchers are increasingly using animals either injected with human cells or with human tissue grafts to get a more accurate understanding of how a compound or drug works in people. A leading panel of scientists and ethicists has released a report calling for more scrutiny, regulation, and legal boundaries on this type of research, says the Guardian's Alok Jha. In particular, the panel says that future research into areas like human cognition and reproduction are of the most concern to the public when it involves animals containing human material. The panel didn't recommend that such work be outright banned, Jha says, but said it should be "most carefully considered."

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.