Digested mulberry leaves have turned into fibroin, a type of protein that is stored in a pair of glands that run the entire length of the caterpillar.
हे द्रव्यरुपात असलेले रेशीम जेव्हा हवेच्या संपर्कात येते तेव्हा त्याचा घट्ट धागा बनतो.