Fig. 10. S13A cells remain abnormally elongate and continue to translocate, albeit at reduced velocity, at the deduced peak and in the deduced back of a self-generated natural wave of cAMP. (A,B) Velocity plots of a representative JH10 cell and a representative S13A-1 cell in respective homogeneous aggregation territories responding to three natural sequential waves of cAMP. The phases of the wave (A+B, C+D) are deduced from the velocity plots described previously (Wessels et al., 1992). (C,D) Centroid tracks of the representative JH10 cell and representative S13A cell through the three successive natural waves (1,2,3) in which the deduced peak plus back portions (phases C plus D) are boxed. Arrows point in the direction of the interpreted aggregation centers. (E,F) Amplified centroid tracks through one wave and associated cell morphologies. Similar results were obtained for nine additional S13A-1 cells and ten S13A-2 cells analyzed in a similar fashion.