| Immunoprecipitation assays further revealed that Ebp 1 co precipitates with nucleolin from HL 60 cytoplasmic extracts . ^^^ The observation that co precipitation was decreased when extracts were treated with RNase suggests that Ebp 1 and nucleolin are present in the same bcl 2 mRNP ( messenger ribonucleoprotein particle ) complexes . ^^^ |