NPHS1 and focal segmental glomerulosclerosis: Another study reported that plasma levels of anti-nephrin antibodies in post-transplant recurrences of focal segmental glomerulosclerosis (FSGS) were high during the recurrence period, and that graft biopsies at relapse showed punctate IgG deposits co-localized with nephrin, and that these punctate IgG disappeared after remission [10].