A novel collagen mimic comprising a tripeptide unit having the formula
(flpYaaGly).sub.n, where flp is 4(S)-fluoro-L-proline, is disclosed. The
collagen mimic has increased stability relative to the collagen-related
triple helices (ProYaaGly).sub.n, (hypYaaGly).sub.n, and
(HypYaaGly).sub.n.