Parasite Cells are small red idle cells that will consume all of your mass if you don't get rid of them in time.
These entities were developed and coded by Zeach, but never released to the public.
There are maximum 8 parasite cells on one server. They are idle, but if you touch them, they will stick to you and start consuming your mass.
To kill them, you have to split-kill them. After eating them, you will pop in 16 pieces.