brain ribonucleoprotein particles containing heterogeneous nuclear rna ( hnrna ) and a large number of polypeptides ranging from 23000 to 150000 molecular weight were treated with pancreatic and t1 ribonucleases at low ( 0.1 or 0.5 microng plus 5 or 25 units/ml ) , high ( 2 microng plus 100 units/ml ) and very high ( 20 microng plus 1000 units/ml ) concentrations .
C0006104
brain
C0086045
concentrations