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Comparison of limb patterning genes in the eutardigrade Hypsibius exemplaris relative to the morphology of the fourth leg pair in different tardigrade groups. A Heterotardigrade Stygarctus leg. B Heterotardigrade echiniscid leg. C Eutardigrade Milnesium leg. D Eutardigrade H. exemplaris leg. E Expression pattern at stage 16 of H. exemplaris development. Scale bar = 10 μm. White arrowheads indicate leg sensory organs
