Concentrations of the test item in serum , heart and muscle tissues were in a roughly similar order of magnitude around the time of COMPOUND_XXX peak serum levels after 4 weeks of treatment with a trend towards slightly lower values in tissues than in serum .
Concentrations of the test item in serum , heart and muscle tissues were in a roughly similar order of magnitude around the time of COMPOUND_XXX peak serum levels after 4 weeks of treatment with a trend towards slightly lower values in tissues than in serum .
O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O