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Broader pSHF Cre expression is seen Gli1CreERT2 embryos than in Mef2cAHF::Cre embryos. Sagittal sections at E10.0 showing β-gal activity in Mef2cAHF::Cre;R26Rfl/+ embryos (A and B) and Gli1Cre-ERT2/+;R26Rfl/+ embryos (C and D) treated with TM at E7.5 and 8.5. β-Gal activity extends more posteriorly in the Gli1Cre-ERT2/+;R26Rfl/+ embryos than in the Mef2cAHF::Cre;R26Rfl/+ embryos. Brackets indicate the posterior SHF with the DMP as the posterior margin. At, atrium.
