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...C domains). The hinge confers segmental flexibility. [Diagram of (a) IgM pentamer and (b) IgA a dimer.] Figure 10 (a) IgM is a pentamer of the basic four-chain immunoglobulin structure whereas (b) IgA is a dimer. In Figure 10, each molecule is joined by an extra joining (J) chain. When IgA is secreted, it has an additional chain, the secretory component. (Note:...

...C, and M in the cartoon-- that I think need to be kept in the air for any form of effective systems practice. The metaphor of the juggler keeping the four balls in the air is a powerful way for me to think about what I do when I try to be effective in my systems practice. It matches with my experience. It takes concentration and skill to do it well and makes me think...