(A) qPCR analysis of VWF mRNA in HUVEC, HREC, and RF/6A using primers that amplify homologous regions of human and rhesus mRNAs. (B) Transmission electron micrographs of HUVEC, mREC, and RF/6A-1. WPB are long rod-like structures, denoted by “W.” Scale bar = 2 μm. (C) Low (top) and high (bottom) magnification images of immunofluorescent staining for Rab27a in HUVEC, and RF/6A cells. Note rod-like structures corresponding to WPB in HUVEC, which are absent in RF/6A-1 and -2, and sporadic in RF/6A-3. Scale bar in low magnification = 50 μm, in high magnification = 10 μm.