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Fig. 3. Osr1/Osr2 are required for wnt2b and raldh2 expression in the lpm. (A-X) Analysis of stage 34/35 unilateral-injected embryos shows that Osr1/Osr2 are required for expression of nkx2.1 (A-C) and sox2 (D-F) in the epithelium, whereas shh (G-I) is unaffected. In the lpm, wnt2b (J-L) and raldh2 (M-O) are absent, while foxf1 is unaffected (P-R). Black arrows indicate normal expression on the control side and red arrows indicate lack of expression on the Osr1/Osr2-MO-injected side (right). Endoderm outlined by a yellow line. Numbers of embryos with the shown phenotype are indicated. fg, foregut; hg, hindgut; de, dorsal endoderm; pe, posterior endoderm; e, esophagus; l/t, presumptive lung and trachea; lv, liver; lpm, lateral plate mesoderm; k, kidney; s, stomach.
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