FRANCIS LEROY & DORIO ERICO, BIOCOSMOS / SCIENCE PHOTO LIBRARY FRANCIS LEROY & DORIO ERICO, BIOCOSMOS / SCIENCE PHOTO LIBRARY
Animation of an antibody binding to antigens on two transmembrane proteins (red). Each Y-shaped antibody molecule has two arms (centre right and centre left) that can bind to specific antigens, for instance bacterial or viral proteins. The arms and trunk of the antibody are joined by flexible polypeptide chains (white). This area is known as the hinge region, as it allows the two arms of the Y to move relative to one another. In this clip, this region allows the fixation of an antigen present on two membrane proteins that move on the cell surface.
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