The use of a technique of in vivo microspectrophotometry with ultraviolet polarized light on frog myocardial trabeculae or isolated fibers has indicated an increase in the fraction of oriented aromatic aminoacids and a decrease in the fraction of bounded nucleotides, during the contractile event.
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The corresponding record at NLM can be accessed at https://www.ncbi.nlm.nih.gov/pubmed/827389