Here is a common garden spider building a web in front of my shed. You can just about see (and more so if you click for the larger image) how the silk comes from the spinnerets at the end of the the abdomen and then is handled by the rear legs. If you look very closely you can see that each of the lines in the web (but not the radial ones) is covered with tiny, regularly spaced droplets of stickiness.

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