Fig. 1From: IgY antibodies in human nutrition for disease preventionStructure of avian IgY versus mammalian IgG. Both molecules contain two heavy and two light chains, which consist of a variable domain (VHÂ and VL) and four constant domains (CH1, CH2, CH3 and CH4), respectively. IgG has a longer hinge region, which makes it more flexible than avian IgYBack to article page