A month after she put the trunk on the shelf, a man came to the museum. He was polite, careful about the dust. He wore a wool coat and a lanyard without a badge. "I saw the sign," he said. "FSC-A."

: It is primarily used to differentiate cells based on size . Larger cells produce a higher FSC-A signal, while smaller debris or microparticles like exosomes produce much lower signals.

In laboratory research, FSC-A is a standard parameter used to analyze individual cells as they pass through a laser beam. Addgene Blog Definition : It represents the total area under the curve