The synthesis and storage of histones during the oogenesis of Xenopus laevis

Further data, including two-dimensional gel electrophoresis and peptide mapping of newly synthesized proteins, confirms the view that oocytes make several types of histone. The newly synthesized histone is present in both nucleus and cytoplasm, but at a higher concentration in the oocyte nucleus and in great excess over the DNA binding sites. The unfertilized egg seems to contain a pool of histones detectable on two-dimensional electrophoretograms. The peptide maps of these proteins are consistent with their identification as histones. The egg contains enough histone to support nuclear replication through most of cleavage.