Cambrian Explosion Domestication Deuterostomes Mollusc Evolution Genetic Analysis Radiodonts Leech Evolution Ecdysozoans Morphological Changes Bats Sponges Skeletons and Shells Butterflies Species Diversity Plant-Eating Animals Bilaterians Complex Life Forms Island Syndromes Iguanas Reproductive Strategies Ctenophora Saber Tooth Evolution Bioluminescence Hooved Reptiles Early Animals Early Marine Life Mandibulates Pronghorn Evolution Size Changes Amphibian Evolution
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The Nature paper shows that tiny blastopore tissue from a ctenophore can instruct host embryonic cells to form new mouth and axis structures, a result that could push axis-patterning back to the origin of animals.
