Copper (1x10* /nmoles/g wet weight) 
Figure 2. Copper profiles constructed from gel permeation 
chromatography from 100,000 x g supernatant fluid of homogenized 
digestive glands from 25 mussels. HMW designates high-molecular- 
weight protein fraction containing metalloenzymes; LMW designates 
low-molecular-weight protein fraction containing metallothionein. 
The numbers adjacent to the curves indicated the concentrations 
of copper to which the mussels were exposed. 
112 
