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The following equation is suggested to describe the relationship between the light which is incident on the frog skin and that transmitted through it: I i is the intensity of the incident light, I t is the intensity of the transmitted light, R is the fraction of light absorbed by a variable pigment system, and C is the fraction of light not transmitted because of constant optical properties of the skin. R can be expressed in terms of the ratio of the total area blocked by opaque pigment particles, x, to the total area illuminated, A: It can then be shown that: where B = A − AC − x0 and x0 is equal to the initial area covered by opaque pigment particles.
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BITENSKY, M., BURSTEIN, S. Effects of Cyclic Adenosine Monophosphate and Melanocyte-Stimulating Hormone on Frog Skin In Vitro. Nature 208, 1282–1284 (1965). https://doi.org/10.1038/2081282a0
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