Figure 7

Calibrating the relationship between gel mobility and transcript length. The precise gel mobilities of 94 transcripts are plotted against the base 10 logs of their exact lengths based on their 5'- and 3'-ends as determined by RACE. The exponential fits to the top, middle and bottom 2 cm of gel are shown by three black lines with the best fit parameters y = -0.0167x + 4.3456 (R² = 0.94), y = -0.0176x + 4.4088 (R² = 0.92) and y = -0.0228x + 4.8286 (R² = 0.91) respectively.