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Convergent extension is an evolutionarily conserved collective cell movement that elongates the body axis of all animals and is required for the morphogenesis of several organ systems. Decades of study have revealed two distinct mechanisms of cell movement during CE, one based on cell crawling and the other on junction contraction. How these two behaviors collaborate during CE is unknown. Here, using quantitative live cell imaging we show that these two modes act both independently and indoi:10.1101/2021.01.12.426405 fatcat:uuuuv7zbszbxpm36lany4iik6y