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Fig. 1. Ci-sFRP1/5 marks the difference between anterior and posterior
ectoderm. In situ hybridization for Ci-sFRP1/5 at the 64-cell
stage on whole embryos (A, animal view, anterior towards the left),
whole animal explants (B), anterior animal a-line explants (C)
and posterior animal b-line explants (D) explanted at the eight-cell
stage. The scheme to the left illustrates an eight-cell stage embryo in
lateral view. a- and b-line cells are shown in red and green,
respectively.