Van Nostrand, W. E., Wagner, S. L., Suzuki, M., Choi, B. H., Farrow, J. S., Geddes, J. W., et al. (1989). Protease nexin-II, a potent antichymotrypsin, shows identity to amyloid beta-protein precursor. Nature, 341(6242), 546-9. https://doi.org/10.1038/341546a0 (Original work published 1989)