Pregnancy and Multiple Sclerosis (MS): A Beneficial Association. Possible therapeutic application of embryo-specific Pre-implantation Factor (PIF*). Paidas MJ, Annunziato J, Romano M, Weiss L, Or R, Barnea ER Am J Reprod Immunol. 2012 Jul 17. PMID: 22805418. Abstract CommentRecommendBookmarkWatch