<unk>  are nongreen, fast growing plant<unk>  which can multiply their numbers up to 100-fold within one week in adequate culture medium and good culture conditions. This cultivar of<unk>  is kept as a<unk> culture and more specifically as<unk> suspension culture (a specialized population of<unk>  raised by scientists in order to study a specific biological property of a<unk> . In<unk> suspension cultures, each of the<unk>  is floating independently or at most only in short chains in a culture medium. Each of the<unk>  has similar properties to the others. The model plant system is comparable to HeLa<unk>  for human research. Because the organism is relatively simple and predictable it makes the study of biological processes easier, and can be an intermediate step towards understanding more complex organisms. They are used by plant physiologists and molecular biologists as a model organism.
Tobacco BY-2 cells
Langhans giant cell
Cancer Cell
Immunoblast
Olfactory receptor neuron
Cancer stem cell
Cell 
Koilocyte