<unk> , also known as investigative<unk>  is the scientific study of disease processes through the microscopic or molecular examination of organs, tissues, cells, or body fluids from diseased organisms. It is closely related, both historically and in modern academic settings, to the medical field of<unk> .
Experimental pathology
Animal disease model
Animal testing
Clinical epidemiology
Drug coupon
Safety pharmacology
Preclinical development
Human challenge study