Listed are tyrosine kinases that are PP2 sensitive, expressed in arterial ECs, and likely localized to cell–cell contacts. Their susceptibility to other inhibitors is indicated. −, inhibition by <60% ; +, inhibition by >60%; blank, no data available. PECAM-1 response was inhibited by Genistein, PP2, and SU6656 and was not inhibited by Imatinib, LFM-A13, and VEGFR kinase inhibitor (Fig. 5, A and B). Kinase susceptibility is obtained from the following sources: Genistein, Akiyama and Ogawara (1991); PP2 and Imatinib, http://www.invitrogen.com/downloads/SelectScreen_Data_193.pdf; SU6656, Blake et al. (2000); LFM-A13, Chau et al. (2002) and Mahajan et al. (1999); and VEGFR kinase inhibitor, Cools et al. (2004) and Fraley et al. (2002).