Abstract
The poly(A+)RNA of the free mRNP of mouse Taper ascites cell contains a very reduced number of different mRNA sequences compared to the polysome poly(A+)RNA. By the technique of mRNA:cDNA hybridization we have determined that the free mRNP contains approximately 400 different mRNA sequences while the polysomes contain about 9000 different mRNAs. The free mRNP poly(A+)RNA sequences are present in two abundance classes, the abundant free mRNP class containing 15 different mRNA sequences and the less abundant free mRNP class containing 400 different mRNAs. The polysome poly(A+)RNA consists of three abundance classes of 25, 500 and 8500 different mRNA sequences.
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