11. Olsson focuses his research primarily on the embryological development of the vertebrate head. 12. Classification of cancers often is oriented around the embryological origin of the tissue. 13. Congenital urethral diverticula can arise from several embryological sources. 14. Embryological evidence does not support a clear division between the two tribes, either.15. Embryological analyses show that the carapacial ridge initiates the formation of the turtle shell.16. The junction between the embryological foregut and midgut lies just below the major duodenal papilla. 17. The Laureae and Perseeae tribes are not well supported by any molecular or embryological studies. 18. For example, it is uncertain whether the ancestral mollusc was embryological origins of spicules. 19. The development of the secondary palate commences in the sixth week of human embryological development. 20. Enterocoelous development is the stage of embryological development of deuterostomes in which the coelom forms.
