text: Here, we show that one BLT, [<< 1-(2-methoxy-phenyl)-3-naphthalen-2-yl-urea >>] (BLT-4), blocked [[ ABCA1 ]]-mediated cholesterol efflux to lipid-poor apoA-I at a potency similar to that for its inhibition of SR-BI (IC(50) approximately 55-60 microM).