Efficient in vivo ICAM2 knockdown in the endothelium when siICAM2 was delivered using C6-KH polymer. (a) siICAM2-C6-KH and siCON-C6-KH were injected at 2 mg/kg in mice. Two days post-injection, endothelial-enriched (intima) and SMC-enriched fraction (leftover) RNAs were prepared and analyzed by qPCR for gene expression. (b) As a quality control, expression of markers of ECs (PECAM-1), medial SMCs (SM22a), and leukocytes (CD45) were determined, whereas (c) ICAM2 expression was analyzed by RT-qPCR. n = 5, mean ± SEM; ***p < 0.001.