Researchers from the Laboratory Headed by Hall and Kay Have

Researchers from the laboratory headed by Hall and Kay have determined that fruit flies (Drosophila) have a multitude of independent biological clocks located throughout their bodies. They accomplished this by

A) being able to tell when the period (per) gene was turned on.
B) genetically engineering fruit flies to contain the firefly luciferase gene.
C) observing the molecular activity of important clock genes in a single, living, intact fly.
D) all of the above.

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