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So we're looking at an Aplysia stretched out. We're going to focus in on the gill and the siphon. We're going to apply an extremely weak stimulus so you can see the amplification with s...

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And so what I would like to do now is continue this developmental story. And don't be worried here. So what I'm going to try and do is really focus on this question of neuronal identit...

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So we're introducing ourselves into this process about one month after fertilization, when the entire embryo is smaller than the size of a dime. And we're going to look into the nervou...

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So let's look, for example, just at three cells here. They are equivalent in potential, they could give rise to any region of the nervous system, but by chance they occupy different posit...

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We're going to be looking at these electrical impulses, these flashes, which are called action potentials, are crossing three neurons in the circuit here. And as we look in higher po...

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Well, let me show you this now, in a video that Mike Oldstone at Scripps Institute in San Diego put together. Let's run this. This is a cytotoxic T cell that you see on the top. And ...

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You remember messenger RNA and new viral proteins being made essentially to assemble new virions, but something else can happen to those viral proteins. There are host proteins called ubi...

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Once a gene has been located and transcribed into mRNA it must first be edited before it can be translated into a protein. This editing process is called splicing. It involves removing ...