1. Department of Biohybrid & Medical Textiles (BioTex)AME—Institute of Applied Medical EngineeringHelmholtz InstituteRWTH Aachen University Forckenbeckstraße 55 52074 Aachen Germany
2. Electron Microscopy FacilityUniklinik RWTH Aachen Pauwelsstrasse, 30 D‐52074 Aachen Germany
3. Bioforge LabUniversity of ValladolidCIBER‐BBN Paseo de Belen 11 47011 Valladolid Spain
4. Aachen‐Maastricht‐Institute for Biobased Materials (AMIBM)Maastricht University Urmonderbaan 22 6167 RD Geleen The Netherlands