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Blue Sky Ideas:
Cellular reproduction:
Most notably a cell which has the ability to pass along any “learned” behavior which can be beneficial in the current environment. For example, a cell which passes along an “immunity” to a specific virus.
Traffic
Stop lights. Aggregate wait times vs distance traveled.
Cellular emergencies
Cells that operate like the brain/body during emergencies. When an emergency occurs, “assets” will be diverted from less important cells to vital cells. For example, when a person's blood pressure drops, sensors in the blood vessels send signals to increase their heart rate but constrict blood vessels supplying the less vital organs so that the vital organs receive . Perhaps this could be combined with the cellular reproduction idea depending on the amount of detail which I would to go into each.
Cell membrane: