Adherent macrophages were incubated for 18 h with culture medium containing 10 μg/ml human oxidised LDL in the presence of 0.1 mmol/l [3H]oleate conjugated with BSA [13 (link), 14 (link)]. Cellular lipids were extracted and the radioactivity of cholesterol [3H]oleate was determined by thin-layer chromatography [13 (link), 14 (link)].