Fig. 7. Distribution of TSC potential in the 6 s.p. ChE. TSC colonies derived from the ChE median and ChE perimeter of 6 s.p. ChEs (n=20). Range of TSC colonies obtained from each region of individual tissues are indicated in square brackets. There was a significant difference between the ChE median and perimeter at P<0.001. One exceptional ChE produced TSC colonies greater in number than three times the mean in each ChE region: ChE median, 28 TSC colonies; ChE perimeter, 69 TSC colonies.