Fig. 4. [¹⁴C]CO₂ incorporation in control embryos and in embryos recovering from heat shock. Control (C) and heat-shocked (HS) (22–50°C) embryos were incubated at 25°C for 2 or 4h in [¹⁴C]NaHCO₃. The protein (P), nucleic acid (NA) and precursor pool (Pre) fractions were obtained as described in Materials and methods, and ¹⁴C incorporation was determined by scintillation counting. The inset shows the results for protein and nucleic acid radioactivity on an expanded scale.