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Fig. 7. RPTP{psi} acts upstream or in parallel to Delta/Notch signalling and is required for transcriptional activation of both her1 and her7. (A) Comparison of deltaC, her1 and her7 expression in RPTPmo embryos, her1 morphants, aei mutants and embryos co-injected with RPTPmo and her1mo. All embryos are stained equivalently. (B) Reduction of neither RPTP{psi} nor her1 in a aei mutant background results in an enhancement of the aei mutant phenotype, indicating a role for RPTP{psi} either upstream or in parallel to Delta/Notch signalling.