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| New theory emerges for where some fish became four-limbed creatures Posted: 27 Dec 2011 11:26 AM PST A small fish crawling on stumpy limbs from a shrinking desert pond is an icon of can-do spirit, emblematic of a leading theory for the evolutionary transition between fish and amphibians. This theorized image of such a drastic adaptation to changing environmental conditions, however, may, itself, be evolving into a new picture.  |
| Global view of how HIV/AIDS hijacks cells during infection Posted: 21 Dec 2011 11:03 AM PST Scientists have identified how HIV -- the virus that causes AIDS -- hijacks the body's own defenses to promote infection. This discovery could one day help curb the spread of the HIV/AIDS pandemic.  |
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