Dictyostelium expressing N-APC lack the ability to maintain direction during migration. Dictyostelium expressing N-APC lack the ability to maintain direction.

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Dictyostelium expressing N-APC lack the ability to maintain direction during migration. Dictyostelium expressing N-APC lack the ability to maintain direction during migration. (A,B) The first frame of a time-lapse movie of Dictyostelium amoebae chemotaxing towards a micropipette filled with cAMP is shown. Black lines indicate the migration paths taken by four individual amoebae over the course of the movie. Arrowheads indicate the cell position at the start of the movie. (A) Control amoebae expressing YFP. (B) Amoebae expressing N-APC. (C,D) xy coordinates of chemotaxing Dictyostelium cells were recorded from time-lapse movies. The median distances covered by cells over time is shown in C. (D) Values are a moving average of the cosine of the angle made by connecting the xy position of a cell at three consecutive time points. A cosine of 1 indicates movement in a straight line; zero indicates a turn of 90 degrees. The mean of 20 cells is shown. Error bars show standard deviation. (E) Coomassie Blue stain of tracks left by Dictyostelium slugs during phototaxis towards light at the bottom of the image. Wild-type slugs migrate efficiently towards the light, whereas slugs expressing N-APC do not. Scott A. Nelson et al. Dis. Model. Mech. 2012;5:940-947 © 2012. Published by The Company of Biologists Ltd