t-PA localization to WP bodies in HUVECs after NaBut pretreatment.

HUVECs pretreated with sodium butyrate (NaBut; 3 mM) for 20 hours were processed for immunoelectron microscopy and labeled for VWF (panel A) and t-PA (panels B and C). t-PA and VWF were immunodetected in WP bodies. Original magnification × 54 500 (panels A, B, and C).