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A low molecular weight RNA was released from the purified rattlesnake 28 S RNA by brief heat treatment as well as by treatment with 80% dimethylsulfoxide or formamide. The sedimentation coeficient of this low molecular weight RNA was found to be 5.5 S, corresponding to a nucleotide number of 140 and a molecular weight of 46 000. It was also observed that 5.5S RNA is present in equimolar ratio to 5 S rRNA. Heat treatment of the purified 60 S ribosomal subunit also released the 5.5 S RNA. The possibility that this low molecular weight RNA is located on the surface of the large ribosomal subunit is discussed.

Studies on the low molecular weight RNA associated with 28S ribosomal RNA from Crotalus durissus terrificus liver