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Phase-contrast images of TIL cultures from optimized pooling protocol. Images were taken on day 7 at 5× magnification. (a) TIL 36 culture assigned as ‘high density’. (b) TIL 36 culture assigned as ‘low density’. (c) TIL 36 culture assigned as ‘no growth’. (d) TIL 85 cultures assigned as ‘high density’. (e) TIL 85 cultures assigned as ‘low density’.
