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Effect of human umbilical vein endothelial cell (HUVEC)-conditioned media on U1 p24 production. p24 levels in culture supernatants from U1 cultured alone (105 cells/well) (□), or in two-fold dilutions of conditioned medium from resting (hatched) or activated HUVEC (▪). Data are expressed as p24 (log pg/ml), mean and s.e.m. of 10 experiments. ***P < 0·005.
