Cells in sentence

1993 examples of Cells in a sentence

And they will either enter into this so-called cellular suicide, programmed cell death, or they will form unhealthy daughter cells and enter into apoptosis once they have divided.

This is cultures, identical cultures, of cervical cancer cells.

What we see are, first of all, a very active culture, a lot of divisions, and then very clear nuclei once the cells have separated.

The cells round up for division, but they're very static in that position.

We'll see two cells in the upper part of the screen attempting to divide.

Now importantly, these Tumor Treating Fields have no effect on normal undividing cells.

And those were the most primitive forms of cells in a sense, those little drops of oil.

But then there was another really interesting step where things became completely different, which is these cells started exchanging and communicating information, so that they began to get communities of cells.

And at that stage, we have multi-cellular communities, communities of lots of different types of cells, working together as a single organism.

We have lots of cells that are not out for themselves anymore.

These communities of cells, again, began to abstract information.

So neurons are the information processing apparatus that those communities of cells built up.

The hippocampus is formed of two sheets of cells, which are very densely interconnected.

Place cells are also being recorded in humans.

And place cells in their hippocampi would fire, become active, start sending electrical impulses whenever they drove through a particular location in that town.

Well these two cells here show us that the boundaries of the environment are particularly important.

And indeed, on the inputs to the hippocampus, cells are found which project into the hippocampus, which do respond exactly to detecting boundaries or edges at particular distances and directions from the rat or mouse as it's exploring around.

So that's one way in which we think place cells determine where the animal is as it's exploring around.

It's as if you remember where the flag was by storing the pattern of firing across all of your place cells at that location, and then you can get back to that location by moving around so that you best match the current pattern of firing of your place cells with that stored pattern.

And place cells also get this kind of path integration input from a kind of cell called a grid cell.

Now grid cells are found, again, on the inputs to the hippocampus, and they're a bit like place cells.

And as it moves around, the electrical activity can pass from one of these cells to the next cell to keep track of where it is, so that it can use its own movements to know where it is in its environment.

Do people have grid cells?

Well because all of the grid-like firing patterns have the same axes of symmetry, the same orientations of grid, shown in orange here, it means that the net activity of all of the grid cells in a particular part of the brain should change according to whether we're running along these six directions or running along one of the six directions in between.

And indeed, you do see it in the human entorhinal cortex, which is the same part of the brain that you see grid cells in rats.

And that would be represented by the firing of boundary-detecting cells.

He's also remembering the path he took out of the car park, which would be represented in the firing of grid cells.

Now both of these kinds of cells can make the place cells fire.

And he can return to the location where he parked by moving so as to find where it is that best matches the firing pattern of the place cells in his brain currently with the stored pattern where he parked his car.

So if this was happening, your memories could start by place cells activating each other via these dense interconnections and then reactivating boundary cells to create the spatial structure of the scene around your viewpoint.

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