5 (PDB: 2MPZ22)) kinks at Gly25 and Asn27, rather than at Gly25 and Gly29, and thus there is no equivalent interface A. Yet, our preparations of crystals in TBS of the Aβ20–34, Aβ20–34, isoAsp23, and Aβ20–34, Asp23Asn constructs appear nearly identical by XRD, ...