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Problems of Celllineage
Nucleus and Cytoplasm
5 other sections not shown
2-cell stage activity adult amphibian anatomical antibodies antigens appearance behaviour blastoderm blastomeres blastopore blastula cell death cell division cell numbers cell populations cell-lineage chimaeras chromosomes cleavage stages crest cells cytoplasm descendants developmental differentiation diploid early cleavage ectoderm egg cytoplasm embryo embryogenesis embryonic induction endoderm example experimental experiments fertilized egg foetus frog future gastrulation gene germinal cytoplasm gill give rise gland gonads grafted cells grey crescent group of cells growth rate haemoglobin hormone important invaginate involve kind larvae later lens limb mammalian mammals maternal melanocytes membrane mesoderm mitotic morphogenetic movements mother nervous system neural crest neural folds neurulation newt normal development nuclear nuclei occur older embryo organism pigment placenta ploidy possible presumptive fate primordial germ cells produce protein regeneration region removal reptiles sea-urchin shell Sinistral somatic cells species sperm spermatozoa synthesis tadpole thyroid tion tissue tube urodele uterus ventral vertebrates vesicle vitro whole yolk