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Fig. 6. De novo synthesis of a 270 kDa protein in liver tissue of
1-day-old postnatals in response to heat shock (2 h, 42°C). No such
response was observed in 18-day-old embryos (score zero in densitometry of
both control and heat-shocked individuals). This protein was identified by
mass spectrometry analysis as fatty acid synthase (FAS). Each lane represents
a different individual. C, control, unexposed individuals; HS, at the end of
the heat exposure.