Allen, T., Rutherford, S., Murray, S., Sanderson, H., Gardiner, F., Kiseleva, E., …Drummond, S. (2007). Generation of cell-free extracts of Xenopus eggs and demembranated sperm chromatin for the assembly and isolation of in vitro-formed nuclei for Western blotting and scanning electron microscopy (SEM). Nature Protocols, 2, 1173-1179