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Let's review how HIV's reverse transcriptase works. The yellow strand is HIV RNA; it's attached to the reverse transcriptase enzyme. Reverse transcriptase uses the hosts cell nucleotides....

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So when HIV buds from a cell, it's not in a mature form. Its proteins are actually in a multilinked chain, so protease comes in and cleaves the proteins, in several different places. So...

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This video was prepared by my colleagues Dieter Egli and Kevin Eggan. And you see here, on the left is what's called a holding pipette, which gently sucks on the egg. The egg is surroun...

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The creature with the spear was huge.There were many other similar creatures.They had ridden behind me on the backs of large animals.Each of them carried a collection of strange-looking weapons.The on...

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One of the most intriguing uses of stem cells can be found in the field of regeneration. Whether the goal is to regenerate damaged heart or nerve cells or to regenerate an entire limb, ...

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When the nucleic acid is relieved of the constraint of being sort of lockstep with another strand in a double helix, it's free to take on all kinds of shapes because it can interact w...

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Zimmer: Another thing about E. coli is that to understand what it means for it to be alive is to understand how it's alive with other E. coli. For a long time, scientists just thought about E. coli ju...

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The inner cell mass cells, which are going to be removed and grown in a Petri dish. We first remove the outer layer that would normally form the placenta. Here the cells are put into a...