variations in metal concentrations on cytosolic metal distribution,cytosolic metals and total metals in each of the three pools were plotted against one another for composite and individual samples of urchin gonads (Fig. 5). The amount of Zn associated with the HMW and LMW pool remain unchanged over the entire range of concentrations (slopes N.S. t-test), while Zn associated with the MT pool increases linearly with a slope of 0.99 (significant at p~