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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. Similarly, molluscs such as snails have only four components in their blood clotting cascade, with a single protease step. This appears to contradict the notion of [[irreducible complexity]] in regard to this process.

==References==

==References==

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<references/>

[[category:biology]]

[[category:biology]]