Fig. 2. Regulators of tracheal cell fate control dap and stg expression independently. Wild-type (A,B), vvl (C,D) and trh (E,F) embryos before the onset of mitosis 16 were hybridized in situ with a probe for either dap (A,C,E) or stg (B,D,F) followed by detection of the probe by fluorescence.