it is being compared to the structure of the city
There are several things of which you could relate a cytoskeleton to a city, for example you could compare it to structure of buildings or the general foundation of a city (the street and sidewalk), both being the general support structures of a city.
There's no city there. "90 degrees south" is the definition of the south pole. There's quite a substantial living structure there, inhabited in shifts by scientists engaged in polar research, but nothing that you could call a city.
structure of boran
Make a comparison between the structure of the human body and the structure of a car.
common city structure
it is being compared to the structure of the city
common city structure
that would be the subway structure
Here is an example of social structure used in a sentence. The neighborhoods of a city is made up of its social structure.
pupu
An aquaduct
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The Forbidden City
kik
The place where you would climb the city's tallest structure is the Washington Monument which is the big pointy thingy close to the White House.