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Fig. 3  Temporal expression patterns of zebrafish MAPKs by RT-PCR analysis through zebrafish development. RNAs used for amplification were isolated from indicated stages. To obtain specific expression patterns, primers flanking the full coding sequences were used, but for erk7, where primers specific for the distinct c-terminus of the erk7 gene were used. Erk4, erk5, erk7, jnk1 and p38b showed dynamic expression levels through zebrafish development compared to erk1, erk2, erk3, erk6 and p38a. β-Actin (β-ACT) was used as a control for constitutive expression.

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Reprinted from Gene expression patterns : GEP, 6(8), Krens, S.F., He, S., Spaink, H.P., and Snaar-Jagalska, B.E., Characterization and expression patterns of the MAPK family in zebrafish, 1019-1026, Copyright (2006) with permission from Elsevier. Full text @ Gene Expr. Patterns