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Fig. 5. RPTPmo embryos show a defect in segment polarity. The expression patterns of markers of rostral (papC, A,D,G; mespa, B,E,H; mespb, C,F,I) and caudal (myod, deltaC; see Fig. 3B and Fig. 8) half-segment identity reveal a requirement for RPTP{psi} for the specification of anteroposterior polarity within somites. (A-C) Wild-type control, (D-F) RPTPmo embryos, (E-I) aei mutant embryos.