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The muscles of six species of North Pacific ocean fish contained from 42 to 142 μg. per 100 mg. wet weight of ribonucleic acid (RNA) and from 0.2 to 2.5 μg. per 100 mg. of deoxyribonucleic acid (DNA). The molar ratio of purine and pyrimidine bases in lingcod and sockeye salmon muscle RNA was: adenine, 1.0; guanine, 2.0; cytosine, 1.0; and uracil, 1.25. Chemical analysis of isolated lingcod muscle RNA indicated that it was a comparatively pure product and was free, or practically free, from protein and amino acids.
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Bluhm et al. (1957) studied this question.
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