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Scheme of hemocyanin evolution in Chelicerata. Color code: black/white, subunit clade 1 (b/c/V/VI); green, subunit clade 2 (a/II); medium blue, subunit clade 3 (d/f/IIIb/IV); orange, subunit clade 4 (e/g/I/IIIa); light blue, d/IV; dark blue f/IIIbQ3; yellow, g/IIIa; red, e/I. See text for further details and explanations.
