the major immunoglobulin in humans and most species from amphibians upwards (but not in fish). IgG fixes complement and crosses the placenta (ie can be passed from mother to foetus). Although mainly present in body fluids some is also present at mucosal surfaces ..., üldisem immunoglobuliini tüüp, mis seob komplementi ja läbib platsentabarjääri, minnes loote organismi