I am assuming that the dipole orientation factor is different for different proteins.
Are you referring to the orientation factor kappa-squared in the Forster fluorescence resonance energy transfer theory? If so, this is rarely measured and is assumed to have the value 2/3. Here is a paper on the subject:
http://www.sciencedirect.com/science/article/pii/S0006349579852431
Yes Dr. Shapiro that is what I was referring to. I needed to make a few FRET calculations. Thank you so much for clearing the point.
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