5LED:
reference: Rigidly connected multispecific artificial binders with adjustable geometries., Wu Y, Batyuk A, Honegger A, Brandl F, Mittl PRE, Pluckthun A, Sci Rep. 2017 Sep 11;7(1):11217. doi: 10.1038/s41598-017-11472-x. PMID: 28894181

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