... the plasticity of vertebrate gastrulation both when experimentally manipulated and during evolution. Using the insights obtained from these experiments we discuss the effects of the increase in yolk volume on the morphology of gastrulation and provide new insights into two crucial innovations during amniote...

...Hallie Kuhn; Richelle Sopko; Margaret Coughlin; Norbert Perrimon; Tim Mitchison Yolk provides an important source of nutrients during the early development of oviparous organisms. It is composed mainly of vitellogenin proteins packed into membrane-bound compartments called yolk platelets...

...Paul Jorgensen; Judith A. J. Steen; Hanno Steen; Marc W. Kirschner Little is known about how metabolism changes during development. For most animal embryos, yolk protein is a principal source of nutrition, particularly of essential amino acids. Within eggs, yolk is stored inside large organelles...

... Yellow (LY) or Rhodamine 6G (R6G). While LY appears to bind to yolk and progressively accumulates in the developing gut primordium, R6G does not show any such binding and remains equally distributed over all cells. Measurements in early and late stages indicate a significant increase in the volume...

... , H.-M. & Malacinski , G. M. (1980). Establishment of the dorsal/ventral polarity of the amphibian embryo: use of ultraviolet irradiation and egg rotation as probes . Devi Biol . 80 , 120 – 133 . 10.1016/0012-1606(80)90503-5 Colombo , R. (1983). Actin in Xenopus yolk...