ICAM-2 does not affect endothelial cell proliferation. Cell proliferation was measured over 5 days on WT and ICAM-2^–/– MCECs plated onto collagen-coated 96-well tissue culture using the MTT assay. No difference in the proliferation rate of MCECs was observed in the ICAM-2–deficient cells. Data are presented as absorbance at optical density (OD) 490 nm (SEM ± SD of 3 replicate experiments).