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Liposomes entrapping fluorescein diacetate were fused with protoplasts of Datura innoxia Mill by employing polyethylene glycol (PEG) as the fusogen. Factors that influence liposome-protoplast fusion were optimized as a function of PEG-concentration and incubation duration, liposome composition and surface charge and liposome:protoplast ratio. Phosphatidylcholine-liposomes were found ideal for the objectives of the study. Fusion index based on per cent fluorescing protoplasts varied among thepmid:17176667 fatcat:vl47qosi2zb5npghiwrpegfhia