Som+ cells in the EPL of mouse OB are produced before birth and express Sp8.

<p>(A) Representative images of the BrdU+/Som+/Sp8+ cells in the EPL of the mouse OB. (B) High magnification of the boxed areas in A showing the BrdU+/Som+/Sp8+ cells. (C) Quantification of the percentage of Som+ cells that were labeled with BrdU in the EPL of the mouse OB. (D) Representative images of the GFP+/Som+/Sp8+ cells in the EPL of the mouse OB four weeks after the replication-incompetent retroviruses encoding GFP were injected into the SVZ of the P0 rat. Scale bars: 50 µm (in D3 applies to A and D), 20 µm (in E2 applies to B and E).