Perforin Expression by CD4+ Regulatory T Cells Increases at Multiple Sclerosis Relapse: Sex Differences. Tejera-Alhambra M, Alonso B, Teijeiro R, Ramos-Medina R, Aristimuño C, Valor L, de Andrés C, Sánchez-Ramón S Int J Mol Sci. 2012; 13(6):6698-710. Epub 2012 Jun 01. PMID: 22837658. Abstract CommentRecommendBookmarkWatch