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Pathways of DOPA reactivity in the cement proteins of P. californica. A. DOPA residues in Pc-1 and Pc-2 are oxidized to DOPAquinones, whereupon they react with cysteinyl residues in the same or other proteins to form cysteinyl-DOPA cross-links. B. The catecholate ion of DOPA chemisorbs to a metal (M) oxide shown in a bidentate binuclear complex. The 2-halogenation of DOPA residues in the proteins is a new pathway that could amplify either A or B, but B seems more likely.
