Synthesis of collagenous fiber m前-多默链 Three steps ↓ m羟化的前7 a synthesis of 多肽链 procollagen (RER) 分子 process(Gog)→ out loo o of cell N/:Q前胶蛋自 ↓内切分子 b procollagen→ 48Gm们 分子 tropocollagen→fbr1N 三原胶原蛋门 c fibril 分子颦合 TTWT胶原原纡维 collagenous fiberSynthesis of collagenous fiber Three steps: a.synthesis of procollagen(RER) → process(Golgi) → out of cell b.procollagen→ tropocollagen → fibril c.fibril → collagenous fiber