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图4 (牙合)创伤5个月,滑膜细胞体与另一细胞突起之间可见点粘连(细箭头),连接处细胞之间有高电子密度的物质存在,胞浆侧微丝密集;细胞膜上有微绒毛突起(粗箭头)(×8 000) 图5 (牙合)创伤3个月,滑膜内膜下层发现类“蚓状小体”结构(粗箭头)(×6 700)
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