Collagen III, IV, VI, XVII Gen-2020-Col3A1 JBC-2000-collagen-IV-in-Hydro Spec-2012-Collagen-I-IV-characterization-by-Raman JCellSci-2015-Collagen-VI Collagen_VI_Biological_Functions JBC-2001-Collagen-XVII CSHPerspect-2011-Collagen-family JCS-2018-Triple-helix-in-collagen-ancient-protein-structure PNAS-2005-Collagen-triplix-formation-in-all-trans-chains