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The B2 domain of PSG1 interacts with SLC and LAP of TGF-β1. Show are Biacore sensorgrams for the interaction of PSG1-Fc domains and CEACAM9-Fc at 2 μm with SLC (A) and LAP (B) of TGF-β1. Purified CEACAM9-Fc and PSG1-Fc proteins containing the N-terminal, A2, and B2 domains of PSG1 were injected over a CM5 sensor chip with immobilized SLC or LAP of TGF-β1. A flow cell to which no protein was coupled served as a surface control. Representative sensorgrams are shown. RU, response units.
