In Mortal Coil, Neelix dies and is resurrected by Borg nanoprobes - according to Seven of Nine, the Borg have assimilated this technology from a species that the Borg designated as Species 149.
In DS9 episode Battle Lines, we have seen a prison moon in the Gamma Quadrant where inmates were made immortal basically the same way (we don't know the exact name of their species, all we know are the names of the factions exiled to that moon - Ennis and Nol-Ennis). Can the species from Battle Lines be the Species 149? The Borg are from Delta Quadrant but they have been to Alpha so could have been to Gamma too.
In DS9 episode Battle Lines, we have seen a prison moon in the Gamma Quadrant where inmates were made immortal basically the same way (we don't know the exact name of their species, all we know are the names of the factions exiled to that moon - Ennis and Nol-Ennis). Can the species from Battle Lines be the Species 149? The Borg are from Delta Quadrant but they have been to Alpha so could have been to Gamma too.