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Although, as Behe points out, Factor XII initiates the "cascade of proteins" in vertebrates, dolphins lack Factor XII <ref>Robinson, A. J., M. Kropatkin, and P. M. Aggeler, 1969. Hagemann Factor (Factor XII) Deficiency in Marine Mammals. Science 166: 1420-1422</ref> and yet their blood is known to clot. This appears to contradict the notion of irreducible complexity in regard to this process.

Although, as Behe points out, Factor XII initiates the "cascade of proteins" in vertebrates, dolphins lack Factor XII <ref>Robinson, A. J., M. Kropatkin, and P. M. Aggeler, 1969. Hagemann Factor (Factor XII) Deficiency in Marine Mammals. Science 166: 1420-1422</ref> and yet their blood is known to clot. This appears to contradict the notion of [[irreducible complexity]] in regard to this process.

==References==

==References==

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