PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 22245250-6 2012 RESULTS: In addition to the expected changes in MMPs and collagen synthesis in HDEs in response to ATRA, prolidase, an important enzyme in the recycling of proline and hydroxyproline from degraded collagen molecules, was significantly decreased by UVA irradiation, and its down-regulation was antagonized by ATRA. Proline 156-163 peptidase D Homo sapiens 105-114