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TRP-2 mRNA expression levels in sheep skin of various coat colors. (A) Representative image and (B) quantification of TRP-2 mRNA expression levels detected by quantitative polymerase chain reaction. *P<0.05. W, white sheep; LA, light-colored areas in black-white sheep; B, black sheep; DA, dark-colored areas and in black-white sheep. TRP-2, tyrosinase-related protein 2.
