Solenopsin, the alkaloidal component of the fire ant (Solenopsis invicta), is a naturally occurring inhibitor of phosphatidylinositol-3-kinase signaling and angiogenesis. - Arbiser,J.L.; Kau,T.; Konar,M.; Narra,K.; Ramchandran,R.; Summers,S.A. (Blood, 2007)