Conus Peptides: Part 2: How a Fish Hunting Snail Captures its Prey (21:31)

submitted by: scivee-team
Although snails are not the first animals that come to mind when venoms are mentioned, there are in fact a large number (~10,000 species) of different venomous predatory snails. The most intensively studied of these are the cone snails (Conus), which have a large number of peptide neurotoxins present in their venoms. Some cone snail venoms are lethal to man; one species causes a 70% fatality rate. How these venoms have been used to understand the nervous system, and how the characterization...

The Surprising World of Prion Biology--A New Mechanism of Inheritance: Part 2: Antigen Presentation and Dendritic Cells (53:35)

submitted by: scivee-team
The immune system is charged with protecting us from invading microorganisms, a task that falls to a complex array of highly specialized cell types spread throughout the body but that must work together as an integrated system. How they accomplish perform their functions can be wonderfully understood by probing the basic mechanisms governing their activities. In the first video, we will consider the overall organization of the immune response in cellular terms, the innate immune system...