Fig. 4. The mean cell speed ± S.D. for 20 cells at each experimental temperature. Cells cultured from a thermal acclimation group denoted by an asterisk move at a mean speed significantly different from the cells of other thermal acclimations at that experimental temperature. (A) Keratocytes from G. mirabilis acclimated to 10°C (blue), 16°C (black) and 25°C (red); (B) keratocytes from C. salinus acclimated to 26°C (blue) and 35°C (red); (C) keratocytes from A. percula acclimated to 26°C (black); and (D) keratocytes from T. bernacchii acclimated to -1.86°C (blue; inset) and 5°C (red; main figure) move at speeds 10-100x slower than other cells. (E-H) Arrhenius plots of 1000/T vs. ln(speed) for cells cultured from G. mirabilis (E), C. salinus (F), A. percula (G) and T. bernacchii (H). Acclimation groups are delineated by the corresponding color codes in panels A-D.