]> late paralysis arrested elongation two fold C_elegans_phenotype_ontology WBPhenotype:0001062 In C. elegans, movement and elongation stop nearly simultaneously soon after the twofold stage of elongation. However, mutant embryos twitch at the one-and-a-half-fold stage of elongation, like control animals, and move as well as control animals at the two- fold stage. embryonic development variant