The fibers in silk cloth and in a spider web are made up of the protein fibroin. Strands of fibroin (blue) emerge from the spinnerets of a spider in this colorized electron micrograph.
The fibers in silk cloth and in a spider web are made up of the protein fibroin. Strands of fibroin (blue) emerge from the spinnerets of a spider in this colorized electron micrograph.