Fig. 2. Non-coherent growth of ExE. Isolated day 7 ExE several minutes after cell A was injected with flourescein-dextran-lysine. Note that cell B, though clearly not adjacent to A, has become about as strongly labelled as A and must therefore be its sister. The more weakly labelled intervening cell, C, is presumably a product of the division immediately preceding the one yielding A and B. Scale bar: 50 µm.