WPBs are often found alongside actin filaments, and some appear to be attached at only one end. (A) HUVECs were transfected with Rab27a-GFP, and a maximum intensity projection was made of confocal images acquired of a cell expressing Rab27a-GFP, VWF (blue), and rhodamine-conjugated phalloidin (red). (B) Maximum intensity projection of confocal images of a HUVECs labeled with MyRIP (red), VWF (blue), and phalloidin Alexa 488 nm (green). Scale bars represent 10 μm.