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lin9 is expressed throughout zebrafish development. A, whole mount in situ hybridization was carried out at the indicated hpf with an antisense and sense probe for lin9. Arrowheads mark the optic tectum. B, semiquantitative RT-PCR at the indicated stages reveals that lin9, lin54, and bmyb transcripts are present during embryogenesis before and after the midblastula transition (MBT).
