3482
Thus, the glucocorticoid -induced membrane perturbation , the possibility to inhibit it by RU 486 , and the inactivity of the structurally related progesterone , refer to relatively specific binding sites for the glucocorticoids in the membrane of erythrocyte ghosts .
 ( cell type: erythrocyte ghosts, None) , ( DNA: binding sites, 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:
 ( cell type: erythrocyte ghosts, None) , ( DNA: binding sites, None) 