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Fig. 5. Effect of cold exposure and hormonal [triodothyronine (T3) or
thyroxine (FT4)] treatment on liver response to oxidative challenge
in vitro. Tissue susceptibility to stress was evaluated by
determining the variations, with concentration of homogenates, of light
emission from a luminescent reaction. Emission values are given a percentages
of an arbitrary standard (44 ng ml1 peroxidase). The curves
were computed from experimental data using equation E=a
C/exp(b C). Preparations from control (C; solid line), 10-day cold
exposed (CE; dotted line), T3-treated (HT3; broken
line), and T4-treated (HT4; broken line) rats.