Kustermann et al, 2010. Figure 5. (A, D) polySia expression is not found in proximity to BrdU-stained cells (green). (B) NCAM-stained cells found in proximity with BrdU stained cells, in the marginal region, outer and inner nuclear layers. This is where neurogenesis constantly occurs in the zebrafish retina. (C) NCAM staining is found in the outer and inner nuclear layers, while polySia expression is only found in the central region of the retina. (E) CRALBP expression is found to start in very close proximity to BrdU-stained cells. (F)While CRALBP expression is found to begin at the marginal zone of the retina, polySia expression is localized to the central regions of the retina.