I want to know the answer to the following question:
The tool that was invented to stain only a small fractions of neurons was called what?
All the background I'm provided with is that "The first real progress toward a modern understanding of nervous function, though, came from the investigations of Luigi Galvani, who discovered that a shock of static electricity applied to an exposed nerve of a dead frog could cause its leg to contract.". Is that enough to answer the question?
Answer: no