Fig. 5. Stromal cultures increased spheroid-forming efficiency. Epithelial sample C was mixed into Matrigel and grown for 2 weeks in either KSFM, KSFM plus 2% serum (K2), K2 and primary stroma (S) or K2, S, and 20-7 M dihydrotestosterone (D) and 10 ng/ml estrogen (O). Bars, SE.