Co-IP was performed as previously described (18 (link)). The following antibodies were used: anti-HA (Sigma-Aldrich, H6908, 1:200), anti-His (Proteintech, 66005-1-Ig, 1:200), isotype rabbit IgG (Santa Cruz Biotechnology, sc-3888, 1:200), and isotype mouse IgG (Santa Cruz Biotechnology, sc-2025, 1:200). A previously described anti-APP rabbit polyclonal antibody RU-369 (1:200; ref. 42 (link)) was used.
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