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Fig. 4. Histological analysis of labeled embryos. All panels are cross-sections of DAB-stained embryos. (A,B) The intermediate mesoderm lateral to the first somite contains progenitors of the glomerulus (A), shown in higher magnification in (B). (C,D) Labeled cells lateral to the second somite can give rise to tubular cells (C), shown in higher magnification in (D). g, glomerulus; gt, gut; n, notochord; nt, neural tube; pt, pronephric tubule; s, somite.