. Analysis of development. Embryology; Embryology. 310 Embryogenesis: Progressive Differentiation. region gives the highest proportion of dif- ferentiation of each tissue. It is possible that the thick mesodermal streak in this area contains definitely localized autonomous pri- mordia of notochord and somites, as well as still migrating heart and nephros fields; the results could equally well be interpreted on the basis of high concentration of growth factors plus a few key inducing substances, quite irrespective of morphological localiza- tions. Entodermal derivatives must largely be consider
. Analysis of development. Embryology; Embryology. 310 Embryogenesis: Progressive Differentiation. region gives the highest proportion of dif- ferentiation of each tissue. It is possible that the thick mesodermal streak in this area contains definitely localized autonomous pri- mordia of notochord and somites, as well as still migrating heart and nephros fields; the results could equally well be interpreted on the basis of high concentration of growth factors plus a few key inducing substances, quite irrespective of morphological localiza- tions. Entodermal derivatives must largely be considered in association with mesodermal ones. Grafts from trout blastodiscs show a distribution not very different from that of somites, for example, for gut tubules (Fig. 119A-C). In the chick, the progressive pat-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Willier, Benjamin H. (Benjamin Harrison), b. 1890. Philadelphia, Saunders
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