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The choroid plexus produces Aβ from APP. Left, negative controls excluding primary antibody. Right, expression of immunoreactive Aβ peptide in tissues and cells. A, B) Aβ expression (brown stain) in Z310 cells by immunocytochemistry. C, D) Green fluorescence corresponds to Aβ peptide in choroid plexus tissue. Note the differences in magnification.
