glycosylation sites (PNGS) within the V1/V2 region (3 for SF162, while 6 and 7 PNGS for Du156.12 and JRFL respectively) of these viruses [46] . Overall the results suggest that the V3 epitopes recognized by three anti-V3 mAbs were exposed on both Du156.12 and JRFL, however mAbs 277 and 903 were not able to bind JRFL due to their subtype-C specific binding activity.