passages.id: split_8_test_2143_passage
passages.type: progene_text
passages.text: By Western blotting the plasma membrane raft fractions obtained using either non - detergent or detergent - based methods contained significant amounts of STAT1 and STAT3 ( up to approximately 10 % of the total cytoplasmic amount ) as well as the integral raft proteins caveolin-1 and flotillin-1 , the IL-6 - receptor signal transducing chain gp130 , the interferon-gamma receptor alpha chain ( IFN-gammaRalpha ) , and the chaperone glucose - regulated protein 58 ( GRP58 / ER - 60 / ERp57 ) .