Results of in vitro angiogenesis inhibition of levamisole and its derivatives in comparison with suramin (5), vehicle (DMSO), and medium alone, as observed by HUVEC number and morphology.

aPercent of the area covered by HUVEC as observed by CD31 staining. bClusters refer to morphologies where several cells that form round or elongated clusters; Cords refer to morphologies where single to a few cells form cord-like structures without forming a network. c(++++) = clusters with area <4%; (+++) = cords with area <4%; (++) = clusters with area >4%; (+) = intermediate morphologies and varying area percentages.