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Screening humanized antibodies from a human Fab phage display library is an effective and quick method to obtain beta-amyloid oligomers. Thus, the present study prepared amyloid-beta 42 oli-gomers and constructed a na?ve human Fab phage display library based on blood samples from six healthy people. After three rounds of biopanning in vitro, a human single-domain antibody that spe-cifical y recognized amyloid-beta 42 oligomers was identified. Western blot and enzyme-linked immunosorbent assay demonstrated this antibody bound specifical y to human amyloid-beta 42 te-tramer and nonamer, but not the monomer or high molecular weight oligomers. This study suc-cessful y constructed a human phage display library and screened a single-domain antibody that specifical y recognized amyloid-beta 42 oligomers.
