5NDA:
reference: Efficient protein production inspired by how spiders make silk., Kronqvist N, Sarr M, Lindqvist A, Nordling K, Otikovs M, Venturi L, Pioselli B, Purhonen P, Landreh M, Biverstal H, Toleikis Z, Sjoberg L, Robinson CV, Pelizzi N, Jornvall H, Hebert H, Jaudzems K, Curstedt T, Rising A, Johansson J, Nat Commun. 2017 May 23;8:15504. doi: 10.1038/ncomms15504. PMID: 28534479

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