Growth curve of wild-type CHO-K1 cells and ΔGMDΔGFT cells. Closed triangle: adherent wild-type CHO-K1 cells, closed square: Adherent ΔGMDΔGFT cells, opened triangle: wild-type CHO-K1 suspension cells, opened square: ΔGMDΔGFT suspension cells. Vertical and horizontal axis shows the cells density and culture days, respectively. Initial number of cultured cells was 1.4 × 105 cells. Mean (SE), n = 3