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. 2015 Jan 27;4(1):e996419. doi: 10.1080/23723556.2014.996419

Figure 1.

Figure 1.

Seam cell division pattern. (A) Diagram of a newly hatched L1 hermaphrodite larva showing the position of 10 seam cells along the lateral midline on the left side (anterior is left, dorsal is up). (B) Diagram showing the division pattern of a representative ‘V’ class seam cell. The seam cell is specified in the embryo but does not divide. During each larval stage the seam cell divides once along the anterior-posterior axis to generate an anterior daughter that differentiates (usually as a hypodermal cell ‘H’ that joins the syncytial hypodermis) and a posterior daughter that retains the seam cell fate and the ability to divide further (blue lineage). In the early L2 stage, the seam cell divides once in a symmetric manner to generate 2 seam daughters that subsequently only divide asymmetrically. After their division in the L4 stage, the seam cells themselves exit the cell cycle and fuse homotypically to form a long syncytial seam cell that secretes the adult cuticle alae (blue lines).