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An antigen receptor protein structure is same in camels and sharks (Talk.Origins)

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Response Article
This article (An antigen receptor protein structure is same in camels and sharks (Talk.Origins)) is a response to a rebuttal of a creationist claim published by Talk.Origins Archive under the title Index to Creationist Claims.

Claim CB211:

An unusual antigen receptor protein structure is shared by camels and nurse sharks (Roux et al. 1998). This, and many other similarities, can't be explained by having a common ancestor.


  • Sarfati, Jonathan, 2002. Refuting Evolution 2. Green Forest, AR: Master Books, p. 113.

CreationWiki response:

(Talk.Origins quotes in blue)

1. Convergent evolution has long been known to occur in large structures, such as the wings of bats and birds. It has long been expected in the structure of molecules, too. Roux et al. (1998) say, "Evolutionary convergence at the molecular level is presumed to be widespread, but is poorly documented." The protein they describe is one example.

Convergent evolution is more of an interpretation than a real explanation. Talk Origins is actually conceding that this claim is 100% correct, but is simply applying an Evolutionary interpretation to it.

The fact is that such shared features cannot be explained by a common ancestor, so Evolutionists had to invent a way of fitting it into their theoretical system. The concept of convergent evolution makes Evolution theory less testable by removing what is actually a failed prediction of the basic concept.

Similarities can be explained under evolution as due to inheritance, convergence, or chance.

Translation: Evolution theory is totally untestable since similarities can be “explained” with or without inheritance. Given a random group of organisms, one could infer any relationship and then dismiss any evidence to the contrary as convergence, or chance. This is not science.

In the case of convergence, we expect similar selective pressures on the organisms with the similarities, and we expect dissimilarity in smaller details of the structure. This is what we observe here. The DNA sequences that code for the proteins are different between sharks and camels (Roux et al. 1998).

Given such radically different animals, this is also expected with design. In computer programming, routines that produce the same result may have to be radically different in different programs because of differences in input methods, variable types, and related code.

Another possibility is that this antigen receptor protein structure is a result of Natural Genetic Engineering in one or both organisms. Such an ability in and of itself implies design in living organisms.