..., but shows a lower level of expression . Pax6A and Pax6B transcripts are detected in visual cells only at the ultrastructural level, probably because a limited amount of transcripts is present in these cells. Inactivation of both Pax6A and Pax6B by RNA-mediated gene interference (RNAi) inhibits neither eye...

...-derived pigment cell precursors. In the present study, we have compared the ECM of neural crest migratory pathways of normal dark and white mutant embryos ultrastructurally, immunohistochemically and biochemically to disclose differences in their structure/composition that could be responsible...

...M. J. Duxson; Y. Usson ABSTRACT Mammalian muscles develop from two populations of myotubes; primary myotubes appear first and are few in number; secondary myotubes appear later and form most of the muscle fibres. We have made an ultrastructural study to investigate how primary and secondary...

... for reprints: Department of Anatomy, University of Turku, Kiinamyllynkatu 10, SF-20520 Turku, Finland 05 07 1989 © 1989 by Company of Biologists 1989 morphometry ultrastructure steroids Leydig cells testis fetal neonatal prepubertal rat Male Wistar rats between fetal day...

...J. B. Kerr; C. M. Knell The ultrastructure and developmental fate of the fetal generation of Leydig cells of the rat testis was studied from the 17th day of fetal life up to 100 days after birth. The number of fetal Leydig cells per testis was determined by light microscopic morphometric analysis...

... upwards. * Present address: Department of Human Anatomy, Oxford University, South Parks Road, Oxford, OX1 3QX, UK 09 12 1987 © 1988 by Company of Biologists 1988 optic chiasma Xenopus ultrastructure fibre organization In Xenopus , the retinotopic...

...C. J. A. H. V. Van Vorstenbosch; E. Spek; B. Colenbrander; C. J. G. Wensing The development of germ cells in the male pig was investigated ultrastructurally in normal and decapitated fetuses. The age ranged respectively from 30 days p . c . till one month after birth and from 52 days p . c . until...

... although three techniques were applied at varying pH values. Indeed previous optical cytochemical analyses on mouse early embryos have recorded a minimal reactivity for acid hydrolases prior to the 16-cell stage ( Mulnard, 1965 ; Solter, Damjanov & Skreb, 1973 ), and, in an ultrastructural study...