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Fig. 4. (A) Hyposmotic saline shifts the reflected wavelengths to the longer (red) end of the spectrum. (B) Returning the preparation to saline (or adding hyperosmotic saline) shifts the reflected wavelengths back to the shorter (blue/UV) end. (C) Norepinephrine causes the reflected wavelengths to shift to the longer end of the spectrum, while (D) adenosine shifts the wavelengths back to the shorter end.