Summary
The temporal muscles of the guinea pig show a sexual differentiation reflected in their histochemical enzyme pattern. Using histochemical methods for mitochondrial (SDH, α-GPDH), and glycolytic enzymes (phosphorylase, LDH) it could be shown, that in adult animals the “male” muscle is a “white” muscle with marked activity of glycolytic enzymes, the “female” muscle a “red” muscle displaying high activity of mitochondrial enzymes. This differential enzyme pattern can be converted by the application of testosterone to the female type during the postnatal development. The male sex hormone thus affects the histochemical enzyme pattern of the muscle, converting the “red”, “female” into a “white”, “male” muscle in the female guinea pig.
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Gutmann, E., Hanzlíková, V. & Lojda, Z. Effect of androgens on histochemical fibre type. Histochemie 24, 287–291 (1970). https://doi.org/10.1007/BF00278213
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DOI: https://doi.org/10.1007/BF00278213