A, Con A capping stages reached by myosin II-null cells expressing myosin constructs: 0, null cell; 1, Ca-1; 2, Ca-2; 3, Wt. B, representative developmental stages reached by myosin II-null cells expressing myosin constructs: 0, Wt-Δ; 1, Wt-1; 2, Ca-2; 3, Sm; 4, Wt. C, developmental stages of AX3 cells at the following times: 0, 8 h (mounds),; 1, 12 h (tipped mounds); 2, 18 h (slugs); 3, 22 h (immature fruiting bodies); 4, 24 h (mature fruiting bodies).