using gel electrophoresis , peptide map analysis , immunoblotting techniques and immuno fluorescence microscopy the existence of polypeptides identical in mr value and charge to polypeptide n1 of oocytes was demonstrated in cultured somatic cells of xenopus laevis , where it was also highly enriched in cell nuclei , although the cellular concentration was much lower than in oocytes .
C0007610
cell nuclei
C0007634
cellular