“…All natural spider and silkworm silks appear to display a nanofibrillar substructure, and there is ample evidence that these fibrils contribute significantly to the prodigious mechanical properties of silks. 64,65 Assembly of RSF into fibrils with native-like structure has been demonstrated; 34,[38][39][40][41]43,44,54,57 however, while such fibrillar artificial silks are relatively robust compared to other biological materials and promise a novel range of properties in composite applications, 38,44 their mechanical properties still fall short of their natural silk counterparts. 9,38,40,43,44,54,57 The diminished capability of RSF to self-assemble is in line with past studies that have revealed deviations in the structure and bonding character of the RSF molecule.…”