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在創傷發生後需要重見人體硬組織時便宜的補骨材料可以用蛋殼製作。但是這種第二類醫材沒有添加生長因子。通常添加生長因子的第三類醫材則很貴。其實便宜的生長因子也的確存在，只是人們對他的瞭解不多，只用一個很模糊的名詞取代。1KG = NT$200 夠便宜吧? 用 KG 算，不用 mg 算。這就是知識的代價。
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