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THE STRUCTURE OF THE FERTILISED EGG
POLARITY AND SYMMETRY GRADIENT
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activity amphibians animal pole apical archenteron archenteron roof aster blastomeres blastopore blastula body caudal cell groups centre centrifugal chemical chemodifferentiation chromosomes cleavage nuclei cortex cortical cristatus cytoplasm Dalcq devel developmental differentiation division dorsal ear-vesicle ectoderm egg cytoplasm egg nucleus egg surface embryo endoderm experiments eye-cup eye-vesicle fertilisation fertilised egg fore-limb formation formed fusion gastrula genes germ gradient gradient-field grafted grey crescent halves harmoniously built Holtfreter host hybrids induction influence invagination larvae later lens limb marginal zone material merogones mesoderm metabolism neural plate neurula newt normal development notochord nuclear factors occur olfactory pit organ primordia organisation organisation-field original phenomena pigment cells planarian polar lobe pole-plasm potency primordium processes produced pronuclei protoplasm reaction regeneration bud role rostral sea urchin sea urchin eggs secondary embryo so-called somites spatial multiplicity species Spemann sperm sperm nucleus stage structure stump symmetry takes place tion tissue transplantation vegetative pole vesicle yolk