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This supports the idea that in embryos from wild-type mothers, dpp H~- mutations cause the transformation of dorsal into ven-tral epidermis. If tissue determined to become dorsal epidermis dies in the dpp rim-null embryos, then one should not see ventral or lateral tissue formed in the double-mutant combination.
As discussed above, the ResD and ResE two-component regulatory proteins play important roles in both aerobic and anaerobic respiration. At present, two genes and one operon involved in nitrate/nitrite respiration are known to be controlled by ResDE: fnr, hmp, and nasDEF.