Antileptons are subatomic particles, the antiparticle of leptons, which can be emitted to disrupt communications in space. (DS9 episode: "Emissary"; ST reference: Encyclopedia)

The Cardassians have used antileptons against Deep Space 9 on two occasions. The first was when Gul Jasad wanted answers for Skrain Dukat's disappearance soon after Starfleet arrived on the station. The second use of the particle occurred several months later, when Gul Gurgey had his ship emit them to stop DS9 from contacting Bajor or Starfleet. (DS9 episode & novelization: Emissary, DS9 video game: Crossroads of Time)

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