earlier studies suggested that the 70k ( 70 x 10 ( 3 ) mr ) polypeptide is a nuclear matrix ( associated ) protein since it is the only u1 rnp-associated antigen that is not released from the nucleus after treatment of the cell with , successively , detergents , dnase i and/or rnase a and high salt .
C0007610
nucleus
C0007634
cell