Mr. Nucleus is the principal of Cell School, which is themed after a plant cell. The school contains hallways representing the smooth and rough endoplasmic reticulum. Miss Membrane is the head of security like the cell membrane. The large storage room represents the vacuole, and the kitchen contains equipment like the chloroplast for making food. Ribo Joe and his wife Julia are ovens that make protein-filled meat, similar to the ribosomes. The janitor Mr. Lysosome Lysol keeps the school clean like the lysosome. The students represent the cytoplasm found throughout the cell.