Human cheek cells

In the image to the left, we see a single human cheek cell.   This view is at 400 power.

The cheek cell is irregularly shaped.  This cell is not an organism.  It was a part of an organism. 

Can you estimate how large the cell is?  (400X)
In the image to the left, we see a cluster of human cheek cells.   This view is at 400 power.

The cheek cells are irregularly shaped.  Can you identify the dark spot in each cell?

 

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