Come up with a question and stream of consciousness reasoning that would justify this answer: an inner cytoplasmic cell membrane
The question is: Gram-negative bacteria are a group of bacteria that do not retain the crystal violet stain used in the gram-staining method of bacterial differentiation. They are characterized by their cell envelopes, which are composed of a thin peptidoglycan cell wall sandwiched between an inner cytoplasmic cell membrane and a bacterial outer membrane.

Answer this question: the cell wall of gram-negative bacterial cells is external to the?
Stream of consciousness: To answer the above question, the relevant sentence is: They are characterized by their cell envelopes, which are composed of a thin peptidoglycan cell wall sandwiched between an inner cytoplasmic cell membrane and a bacterial outer membrane.
