The MA-10 mouse Leydig tumor cell line (a gift of Dr. Mario Ascoli) was derived from the Leydig tumor, M5480P (28 (link)). The Y-1 cell line (a gift of Dr. Bernard Schimmer) was derived from a mouse adrenocortical tumor (29 (link)). General procedures for cell culture were as described previously (1 (link)). A day before the experiment, approximately 3–6 × 105 cells were seeded onto the coverslip (Corning) coated with ploy-Lysine (Sigma) in wells of a six-well plate (Corning).
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