PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 30657308-6 2019 It was found that the small size of metal cations was beneficial for alleviating wear, and PF6- anions exhibited the smallest friction and best antiwear performance at Si3N4 interfaces. silicon nitride 168-173 sperm associated antigen 17 Homo sapiens 91-94