Fig. 1. Comparison of activity of plasma-membrane-associated GSTs in different cell types. This figure represents GST activities measured using 1 mM CDNB and 1 mM GSH at a 2 minute time point with purified plasma membrane preparations from (a) ventriculocytes, (b) spleenocytes, (c) brain cells, (d) hepatocytes, (e) testicular germ cells and (f) epididymal spermatozoa. The inset shows sperm plasma membrane GST activity with increasing concentrations of CDNB in the presence of 1 mM GSH. The activities of total cellular membranes are also represented.