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丝素蛋白，是从蚕丝中提取的天然高分子纤维蛋白，含量约占蚕丝的70%～80%，含有18种氨基酸，其中甘氨酸(Gly)、丙氨酸(Ala)和丝氨酸(Ser)约占总组成的80%以上。丝素本身具有良好的机械性能和理化性质，如良好的柔韧性和抗拉伸强度