Spiders have several glands that produce different kinds of silk. There are seven known types of these glands, but a spider will only have a few of these different kinds, not all seven. The Glandula Aggregata is what produces the sticky substance that spiders deposit onto the rings of a spider web to trap their prey. These drops are made of highly entangled polymers, which are physically or chemically cross-linked and very viscous, elastic, and water resistant.
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