Antibody - Immunoglobulin Type G - This model displays the archetypal Y-shaped structure of IgG monomers, composed of four peptide chains: two identical heavy chains and two identical light chains. In humans, IgG is the most abundant antibody isotype found in circulation. Note: this model is very delicate due to thinness in the hinge region of the antibody. The image shows the model printed in red nylon plastic. WIDTH 2.594 in. HEIGHT 1.153 in. DEPTH 1.989 in