1. 10-cm Tissue-culture dishes.
2. Sterile 50-mL plastic centrifuge tubes.
4. 40 mL polyallomer ultracentrifuge tubes (Beckman, Fullerton, CA): sterilize by rinsing well in 70% ethanol and air-drying in the tissue-culture hood.
5. Phosphate-buffered saline (PBS). PBS tablets are available from Sigma.
7. Reduced serum CEF media (DMEM + 5% FCS + 1% CS).
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