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This paper reports on sex-related differences in free steroid hormone concentrations including the concentrations of three naturally occurring estrogens (17β-estradiol E2, estrone E1, and estriol E3) and one androgen (testosterone T) in the tissues (gills and gonads) of the blue mussel Mytilus edulis trossulus sampled from the Gulf of Gdańsk (Baltic Sea, Poland). The dissimilarity in steroid concentrations...
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