What does differential diagnosis symbolize? On this note, find examples of differential diagnosis. Moreover, analyze the core symptoms common to all depression along with the types of clinical depression. In arriving at a solid understanding of depressive disorders, then proceed to explain an understanding of endogenous biological depressions. How would one classify these different types of depression? Now, separate from the taxonomy (i.g. classification) what medications do think would be appropriate to treat depression, and what brain circuitry is targeted?