The Experimental Evaluation of Cell Proliferation 200 Condition A Condition B Figure 3. 1b. Measuring proliferation rates. Experiment comparing the proliferationd similar inocula of a cell line in two different experimental conditions. Time 0 indicat the time of seeding. the cells were exposed to the test media one day after seedi (this is indicated by the arrow). Condition A: chemically defined medium. Conditioni chemically defined medium plus 10% serum made free of sex steroids by adsorptio ith dextran-coated charcoal