A quick Google search for all three of the sets he mentioned in the song came up with nothing but references to 'That Spells DNA' (Except GTCACGACAG, which appears to be an actual one in animals and plants, whether by coincidence or otherwise,) so it's likely that he just came up with it for the song.
A quick Google search for all three of the sets he mentioned in the song came up with nothing but references to 'That Spells DNA' (Except GTCACGACAG, which appears to be an actual one in animals and plants, whether by coincidence or otherwise,) so it's likely that he just came up with it for the song.