de Groot NS, Aviles FX, Vendrell J, Ventura S. Mutagenesis of the central hydrophobic cluster in Abeta42 Alzheimer's peptide. Side-chain properties correlate with aggregation propensities. FEBS J. 2006 Feb;273(3):658–68. doi: 10.1111/j.1742-4658.2005.05102.x. PMID: 16420488.