Electrophoretic Energy Analysis
From Star Trek : Freedom's Wiki
An electrophoretic analysis is used to test cellular components.
In 2369, Doctor Julian Bashir used the procedure to test a group of cells found in the quarters of Ibudan, a renowned Bajoran smuggler. (DS9: "A Man Alone")
Electrophoresis is a process by which proteins are identified by putting them on a gel and running an electric current through the gel, then staining the gel and measuring how far the proteins moved in comparison to a group of standard proteins that were also put on the gel (bigger proteins move slower, in general.)