| http://digfir-published.macmillanusa.com/lodish_animation/a2003_typei_collagen.html | Chapter 1. Type I Collagen Assembly
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| http://digfir-published.macmillanusa.com/lodish_animation/a2003_typei_collagen_dlap.xml | DLAP questions | 519bca43b11c0f13680000b4 |