Investigator Guidance Series (IGS) This page serves as a central hub for all of the IGS documents. Topics are updated regularly; this page should be the starting point for any coordinator with a question about IRB policy on a specific topic. IGS Search Form Advanced Search Dropdown Advanced SearchTags Search Submit Clear Search If you are human, leave this field blank. Add New IGS Transplantation of Fetal Tissue Last Updated: June 25, 2012 View Document Tracked Changes