using published methods for the isolation of nuclear proteins tightly bound to dna , and resistant to removal by sds or 16-bac detergent and urea , several new protein bands in the region of 55 kd and 62 kd on sds gel and 43 kd and 70 kd on 16 -- bac gel electrophoresis were identified in extracts of avian erythroid nuclei .
C0028589
nuclear proteins
C0007610
nuclei