Defining the viability of tardigrades with a molecular sensor related to death.

As shown in Fig 1 , a treatment with 5 mM sodium azide induced a highly significant fraction (Z-test, α = 0.01, p -value = 0.000) of dead animals in comparison with the controls, when the observation was made immediately after drug addition ( Fig 1A ), while the treatment of tardigrade groups with 10 mM sodium azide resulted in their immediate death.

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