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Freeman H. Quantifying quality.  Neuro Endocrinol Lett. 1999 Jan;  20(5): 27-29

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Rasmussen N, Nelson F, Govitrapong P, Ebadi M. The actions of melanin and melanocyte stimulating hormone (MSH).  Neuro Endocrinol Lett. 1999 Jan;  20(5): 265-282

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