Fig. 1.
Fig. 1. CD164 epitope expression on aorta-associated hematopoietic cell clusters in the 32-day human embryo. / (A) On a transverse section of the trunk, the CD34 antibody stains the endothelium of all blood vessels: dorsal aorta (DA), vitelline artery (VA), cardinal vein (CV), and capillaries in the mesoderm, around the neural tube (NT), and in the mesonephros (Mn). (B) Higher magnification of the same section shows clusters of hematopoietic CD34+ cells adhering to the endothelium on the ventral side of the DA and VA. These progenitors also express CD45 (C), CD43 (D), CD164 103B2/9E10 (E), CD164 105A5 (F), and CD44 (G). Dark and open arrows point to hematopoietic clusters located inside the DA and VA, respectively. Scale bars: (A) 100 μm; (B-G) 25 μm. All sections were from 32-day embryos, with A-F containing 39 somites and G, 40 somites. Original magnifications: (A) ×70; (B-G) ×240.

CD164 epitope expression on aorta-associated hematopoietic cell clusters in the 32-day human embryo.

(A) On a transverse section of the trunk, the CD34 antibody stains the endothelium of all blood vessels: dorsal aorta (DA), vitelline artery (VA), cardinal vein (CV), and capillaries in the mesoderm, around the neural tube (NT), and in the mesonephros (Mn). (B) Higher magnification of the same section shows clusters of hematopoietic CD34+ cells adhering to the endothelium on the ventral side of the DA and VA. These progenitors also express CD45 (C), CD43 (D), CD164 103B2/9E10 (E), CD164 105A5 (F), and CD44 (G). Dark and open arrows point to hematopoietic clusters located inside the DA and VA, respectively. Scale bars: (A) 100 μm; (B-G) 25 μm. All sections were from 32-day embryos, with A-F containing 39 somites and G, 40 somites. Original magnifications: (A) ×70; (B-G) ×240.

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