Figure 2.

Statistical analysis to validate the significance of the NG97(ht) doubling time decrease. The simple linear regression was used and show the correlation between cell doubling time (plotted in "Y" axis) and the cell passages at subculture, which was represented by ordinal values (plotted in "X" axis). The equation that describes the linear regression mathematical model was y = 35.379-1.994x (A). (B) This graphic represents the residual analysis to validate the mathematic model (R² = 715,415; F_1,25 = 30,597 and P << 0,001).