Dual Bioorthogonal Labeling of the Amyloid-β Protein Precursor Facilitates Simultaneous Visualization of the Protein and its Cleavage Products Manuscript Number: 19-0898 Author(s): Simon J. Elsässer, Manija Kazmi, Minh Nguyen Trung, Thomas P. Sakmar, Sophia Schedin-Weiss, Lars O. Tjernberg, Bengt Winblad, Lea S. van Husen