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Fig. 9.Molecular analysis of FGFR1 and FGFR2 loss of function in sea
urchin. (A-D) Mesenchyme blastula, (E-L) mid gastrula,
(M-P) early pluteus. In situ hybridization using fz58 (A-D),
bhmt (E-H), pax258 (I-L) and SM30 (M-P) probes.