I think these pictures are just amazing. They show the pentameric form of IgM (immunoglobulin, also known as antibody), in its flat (inactive) state and then puckered (active). It puckers when it binds to antigen, causing important changes to the tail (Fc portion) of the antibody, allowing immune cells (B cells, dendritic cells, etc) to bind to it (at their Fc receptors). The bottom two photos show inactive and active IgM actually IN the body! Amazing!

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    I MISS THIS :(
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