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sfrp-1 is required for the migration of the QR descendants. (A) Schematic representation of Q neuroblast descendant migration. Arrowheads indicate the final positions of the Q.paa and Q.pap cells. (B) The final positions of the left and right Q.paa and Q.pap cells are indicated relative to the invariant positions of the seam cells V1 to V6 (n>100 for wild type and sfrp-1; for the other conditions, n>50). The broken lines indicates the wild-type position.
