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Biosynthetically lipid-tagged single-chain antibody (Laukkanen et al., Protein Eng. 6 (1993) 449; Biochemistry 33 (1994) 11664) has been used to functionalize europium (Eu 3+ ) chelate-loaded liposomes. The resulting Eu immunoliposomes displayed specific hapten-binding activity and little non-specific binding in time-resolved fluoroimmunoassay (TR-FIA). No loss of entrapped marker nor...
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