Figure 1
From: Self-organization of developing embryo using scale-invariant approach
presents the zygote (P0) at the 2-cell stage and the 4-cell stage of the early C. elegans embryogenesis. The zygote divides into two cells, the anterior blastomere (AB) and the posterior blastomere (P1). AB divides into an anterior (ABa) and a posterior (ABp) cell, while P1 divides into EMS and P2. The long axis is formed by ABa and P2 and the short axis by ABp and EMS.