Abstract
Summary
There was no selective concentration of T-4 or T-3 in any of the subcellular fractions of chicken cardiac tissue. Both T-4 and T-3 followed the same pattern of distribution in all fractions except the mitochondria where T-4 was retained to a greater extent than was T-3. The microsomal fraction consistently deiodinated T-3 at a faster rate than occurred with T-4. Neither the mitochondrial nor the supernatant fractions showed appreciable deiodinating ability under the conditions of the experiment.
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