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Free cytoplasmic mRNPs were isolated from human placenta. An activity of RNase was associated with these particles but was mostly inhibited by a labile protein inhibitor. Both RNase and RNase inhibitor were extractable from mRNPs by 0.5 M KCl. The nature of the association of the RNase-RNase inhibitor complex with mRNPs makes it suitable as a putative system for control of expression and turnover of mRNPs and therefore of protein synthesis.


Journal article


Mol Biol Rep

Publication Date





241 - 244


Cytoplasm, Female, Humans, Placenta, Pregnancy, RNA, Messenger, Ribonucleases, Ribonucleoproteins