At 23[o]C, expression of kuneScer\UAS.cNa under the control of Scer\GAL4da.G32 only partially rescues the septate junction defects of kuneC309 mutants and does not rescue their embryonic lethality. At 28[o]C, expression of kuneScer\UAS.cNa under the control of Scer\GAL4da.G32 rescues both the septate junction defects and embryonic lethality of kuneC309 mutants.