Članovi familije „uvojitih“ proteina su 7-transmembranski receptori za Wnt signalne proteine. FZD4 protein sadrži signalni peptid, cisteinom bogati domen u N-terminalnom ekstracelularnom regionu, 7 transmembranski domen, i C-terminalni PDZ vezujući motiv. Uvojiti-4 je jedini predstavnik family „frizzeled“ receptora koji se potentno vezuje za ligand norin. Taj ligand je funkcionalno sličan sa strukturno različitim Wingless tipom proteina. FZD4 signalizacija indukovana norinom reguliše vaskularni razvoj retine kičmenjaka i kontroliše krvne sudove uva. Većina uvojitih receptora je spregnuta sa beta-kateninskim kanoničkim signalnim putem. Ovaj protein potencijalno učestvuje kao pozitivni regulator signalnog puta Wingless tipa MMTV mesta integracije.[3]
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„Frizzled Receptors: FZD4”. IUPHAR Database of Receptors and Ion Channels. International Union of Basic and Clinical Pharmacology. Arhivirano iz originala na datum 2016-03-03.]