广东费飘职业故本学院 Guangdong Inatitute of Textile Technology Structure 口 Submicrostructure silk from cultivated worm i no identifiable submicrostructure wild silk or tussah silk has internal fibrillar structureStructure  Submicrostructure ◼ Silk from cultivated worm: no identifiable submicrostructure. ◼ Wild silk or Tussah silk has internal fibrillar structure