For the similarly named system or outpost, please see Gamma 7A system or Gamma 7 outpost.

Gamma 7 sector was a region of space. This sector contained the Federation planet Gagarin IV.

In 2365, the USS Lantree was assigned to the Gamma 7 sector, when her entire crew fell victim to a mysterious disease. (TNG: "Unnatural Selection")

In the episode's script, the Lantree was assigned to Gamma seven seven. For the filmed episode, the second "seven" was changed to "sector".
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