a . “We can look high or we can look low, in books or in journals, but the result is the same. The scientific literature has no answers to the question of the origin of the immune system.” Behe, p. 138.
u “Unfortunately, we cannot trace most of the evolutionary steps that the immune system took. Virtually all the crucial developments seem to have happened at an early stage of vertebrate evolution, which is poorly represented in the fossil record and from which few species survive. Even the most primitive extant vertebrates seem to rearrange their antigen receptor genes and possess separate T and B cells, as well as MHC molecules. Thus has the immune system sprung up fully armed.” Avrion Mitchison, “Will We Survive?” Scientific American, Vol. 269, September 1993, p. 138.