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Binding of Sr2+, Ca2+, and Ba2+ to alginate. Cross linking between ions and G-G and M-M or G-M blocks of alginate occurs in specific conformations, (A) Sr2+ binds to G-G blocks solely, (B) Ca2+ binds to G-G and M-G blocks, and (C) Ba2+ binds to G-G and M-M blocks.
