The body pigmentation of an organism is caused by coloring substances and structures that are found in the cells of skin, hair, feathers, or scales, for example. This pigmentation considerably limits investigations of important processes within a living organism (in vivo). To provide a detailed view into the living body, scientists have used transparent model organisms.
Klara, a transparent fish for research on aging

Biochemistry laboratory research, Scientist or medical in lab coat holding test tube with Using Microscope reagent with drop of color liquid over glass equipment working at the laboratory.
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