Sieve element pores in Nicotiana pith culture.
D002462:Cell Membrane; D046508:Culture Techniques; D003593:Cytoplasm; D004721:Endoplasmic Reticulum; D008854:Microscopy, Electron; D008870:Microtubules; D008928:Mitochondria; D010947:Plants, Toxic; D014026:Nicotiana / Q000166:cytology*