Fig 3.
Ectoderm organ systems immunostained for SPL protein with positive cytoplasmic signal, counterstained with hematoxylin. E12: A. cells lining the third ventricle (t) fourth ventricle (o), mesancephalic vesicle (m) and cerebellar primordium (arrowhead). Scale bar 1 mm. B. Rathke’s pouch (arrow). Scale bar 200 um. C. mandibular component of the first brachial arch. Scale bar 400 um. D. epidermis (arrowhead) and neural tube (*). 200 um. E15: E. choroid plexus (arrowhead). Scale bar 800 um. F. olfactory epithelium (*). Scale bar 200 um. G. dorsal root ganglion (arrow). Scale bar 200 um. H. epidermis (arrowhead) and neural tube (*). Scale bar 200 um. E18: I. spinal cord. Scale bar 400 um. J. olfactory epithelium. Scale bar 200 um. K. epidermis (arrowheads). Scale bar 800 um. L. developing pilosebaceous unit (arrowhead). Scale bar 200 um.