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Fig. 5. Effects of cadmium (Cd) exposure on expression of metallothionein mRNA in
gill and hepatopancreas (HP) cells of oysters. Metallothionein levels were
measured using real-time PCR, normalized to the actin mRNA levels and
expressed as % of the respective controls. Cells were exposed to varying Cd
levels (x-axis) for 4 h at 20°C. (A) mRNA for total
metallothioneins and (B) for metallothionein I only. Vertical bars represent
s.e.m. Asterisks denote values significantly different from the respective
controls (P<0.05). N=9.