Peptides on plastic beads

A view of two types of beads used in combinatorial chemistry, as seen under an electron microscope. The beads are approximately one-tenth of a millimeter in diameter. Polystyrene is on the left; pepsyn K is on the right. Image courtesy of George Barany.

Reprinted in part with permission from "A Practical Guide to Combinatorial Chemistry." ©1997 American Chemical Society.