. "Catalysis of the reaction: trans-4-hydroxy-L-proline = cis-4-hydroxy-D-proline." . . "4-hydroxyproline epimerase activity" . "4-hydroxyproline 2-epimerase activity" . "hydroxyproline 2-epimerase activity" . "hydroxyproline epimerase activity" . "L-hydroxyproline epimerase activity" . . .