The Robotic Antibodies are a group of small sentient robots from the 2017 Continuum.
Created by Gyro Gearloose, these miniaturized robots (apparently designed after the DT-87 Drone) were put in charge of patrolling the insides of the Money-Sorting Machine Gyro built for Scrooge. Conscientious and polite workers, the Antibodies had to deal with a mouse infestation soon after the machine's installation, and, after the Machine went haywire, a shrunken-down Webby Vanderquack intent on switching off the Machine's electronic brain. This was, of course, something which they tried to stop her from doing, as it went against their ethos to allow the Machine to be damaged, albeit for the greater good. The Antibodies were blown outside of the Money-Sorting Machine when its head imploded as a result of Webby's action; it is unknown what has happened to them since.
Behind the scenes
They are, among other things, notable for being the only known robotic creations of Gyro Gearloose not to have turned evil (though they still acted antagonistic towards the Ducks due to circumstances).