This family includes the insulin growth factor-like proteins. These proteins are potential ligands for the IGFLR1 cell membrane receptor [1].

1: Murine insulin growth factor-like (IGFL) and human IGFL1 proteins are induced in inflammatory skin conditions and bind to a novel tumor necrosis factor receptor family member, IGFLR1. Lobito AA, Ramani SR, Tom I, Bazan JF, Luis E, Fairbrother WJ, Ouyang W, Gonzalez LC; J Biol Chem. 2011;286:18969-18981. PMID:21454693