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Fig. 2. The tetraspanin protein CD9 alters the stability of the processed forms of transmembrane TGF
. CHO cells expressing TGF
or coexpressing CD9 and TGF
were 35S-Met–35S-Cys pulse-labeled for 12 minutes, chased for times indicated, lysed and subjected to immunoprecipitation with anti-TGF
antibodies. (A) SDS-PAGE analyses of immunoprecipitated 35S-labeled TGF
. (B) Quantification of the transmembrane TGF
bands as a function of the chase time.