Figure 5. Elongation defects of cybrids result from deficient emission of, and response to, induction signals.

Stage 8–9 animal caps (black inset) were dissected from (A–D) lxl or from (E–H) [l]xt cybrid embryos and conjugated to same-stage vegetal halves (white inset) of the following kinds of embryos (A, E) lxl, (B, F) txt, (C, G) [t]xt, and (D, H) [l]xt. Animal-vegetal conjugations were cultured overnight in MBS. The axis of elongation, where present, was highlighted in red. 3–6 representative conjugates are shown for each experiment; see Table 3 for total numbers. Scale bars in (A, D, E, H) and (B, C, F, G): 1 mm.