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Expression of a J1 stage marker in arrested P. pacificus embryos. (A,A′) Seam cell expression Ppa-obi-1p::gfp (arrows) in untreated 24-h-old embryos. (B,B′) Similar seam cell expression (arrows) can be observed in ZTDO-induced arrested 24-h-old embryos. Scale bar in B (20 µm) represents the same magnification for all images.
