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Physiology of a Bombyx mori's (left) and an Aranea diadematus’ (right) spinning apparatus. The silkworm uses its unique buccal spinneret to spin a single thread for its cocoon. The spider possesses five individual spinnerets and uses its rear limbs to spin the thread out of them. Each contains numerous microtubules (middle) that synthesize the nanofibrils of fibroin. Silkworms do not possess microtubules
