The big mess at the middle is an IgM pentamer, which just means five IgM  antibodies bound together into an immunological ninja star. IgM is  usually the first antibody to respond to an infection. The reason you  can be tested for Lyme disease and they can tell the difference between  an active infection and a past infection is that the IgM will be present  if your body is still fighting in its initial encounter with the bug,  while the IgG antibodies will persist for life, hanging around ready to  multiply if you're ever re-infected.
"I'm pretty certain that cake doesn't have much effect on the immune system, but it sure made us happy."
Read more:
Antijenic Drift: Antibody Cake!

Source: Antijenic Drift
Image credits: Jen
Art and Science of Laboratory Medicine 
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1 comment:
very impressive post.sigma antibody cake is very amazing
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