LMP 1 expression causes LAP 1 and EBI 6 to localize to LMP 1 clusters in lymphoblast plasma membranes , and LMP 1 coimmunoprecipitates with these proteins . ^^^ LAP 1 binds to the p 80 TNFR , CD 40 , and the lymphotoxin beta receptor , while EBI 6 associates with the p 80 TNFR . ^^^