6900
Moreover, in a physiological coculture cellular assay system , we show that membrane-bound TNF-alpha and LT-alpha1beta2 act virtually identically to their soluble forms in the regulation of HIV-1 replication .
 ( protein: membrane-bound TNF-alpha, None) , ( protein: LT-alpha1beta2, None) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: RNA,cell type,protein,cell line,DNA, Arguments type: . 
Text: {0} 
Answer:
 ( protein: membrane-bound TNF-alpha, None) , ( protein: LT-alpha1beta2, None) 