00:01
A cytotoxic t -cell can attack all of these except a, transplants of boron tissue, b, cells infected with viruses, c, cancerous cells, or d, viruses free in the bloodstream.
00:14
So a cytotoxic t cell.
00:16
Sometimes it's also called a cd8 plus t -cell, because that's the type of receptor on its surface.
00:22
And it recognizes mhc 1, major histocompatibility complex 1.
00:30
And this is found on all nucleated cells, and it shows off what kind of antigen is inside the cell.
00:39
So it shows antigen from within cells.
00:42
And for a healthy cell, all of this is going to be self.
00:46
It's going to be normal proteins that you find.
00:48
And the t cells won't react to that, because any t cell that reacts to self -antigen is killed during maturation.
00:56
So it will only recognize if it's something that shouldn't be there...